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Chunked Upload stream closing error

Description of the Issue

Using the Box V2 SDK for Chunked Uploads and I'm getting the following error in "UploadPartAsync" method: System.AggregateException: One or more errors occurred. ---> System.ObjectDisposedException: Cannot access a closed Stream.
I'll include my log statements and stack trace below. I'm attempting to send a 50MB file (also happens on all files I try) using Chunked Uploading. It's sending all 7 parts and getting a 200 response back for all parts. but then after the last part, the session commit doesn't happen and I get the above closed Stream error.
Wondering if you've seen this before? It seems like it's trying to call UploadPartAsync an 8th time after the stream is already closed. I had it working a couple weeks ago with the same files (>20MB), but now can't send any. I haven't changed any of the code between it working and not working.

Versions Used

Java SDK: Box.V2 3.4.2
Java: Version 8, Update 161

Steps to Reproduce

Steps to reproduce are to hit Archive project on our web application.
Flow of SDK methods being called are: UploadUsingSessionAsync, which first calls CreateUploadSessionAsync (successfully creates Upload session), then UploadSessionAsync > UploadPartsInSessionAsync > UploadPartAsync (failing here after last part gets sent). It should then call CommitSessionAsync but it's not getting there.

Error Message, Including Log Statements and Stack Trace

22-Mar-18 10:40:35.687 [Viki.sProcessingQueue.18068.50] {History} Job "New Archive test" has been queued for archiving
22-Mar-18 10:40:38.055 [Viki.sProcessingQueue.18068.8] {Archiving} Archiving file SCTZ-0524.pdf , attempt 1 of 3
22-Mar-18 10:40:38.056 [Viki.sProcessingQueue.18068.8] {Archiving} Creating Upload session with uri https://upload.box.com/api/2.0/files/upload_sessions
22-Mar-18 10:40:39.059 [Viki.sProcessingQueue.18068.42] {Archiving} Uploading File part 0 - 8388607 / 50773750
22-Mar-18 10:40:39.106 [Viki.sProcessingQueue.18068.42] {Archiving} Uploading File part 8388608 - 16777215 / 50773750
22-Mar-18 10:40:39.150 [Viki.sProcessingQueue.18068.42] {Archiving} Uploading File part 16777216 - 25165823 / 50773750
22-Mar-18 10:40:39.190 [Viki.sProcessingQueue.18068.42] {Archiving} Uploading File part 25165824 - 33554431 / 50773750
22-Mar-18 10:40:39.229 [Viki.sProcessingQueue.18068.42] {Archiving} Uploading File part 33554432 - 41943039 / 50773750
22-Mar-18 10:40:49.639 [Viki.sProcessingQueue.18068.23] {Archiving} Uploading File part 41943040 - 50331647 / 50773750
22-Mar-18 10:40:50.408 [Viki.sProcessingQueue.18068.35] {Archiving} Uploading File part 50331648 - 50773749 / 50773750
22-Mar-18 10:41:11.647 [Viki.sProcessingQueue.18068.8] {Archiving} Caught exception in UploadFile, destinationPath \Bass\Jobs\New_Archive_test-1095\FileTransfers\1267 , path c:\DataStores\Root\Bass\Jobs\New_Archive_test-1095\FileTransfers\1267\SCTZ-0524.pdf , exception System.AggregateException: One or more errors occurred. ---> System.ObjectDisposedException: Cannot access a closed Stream.
at System.IO.__Error.StreamIsClosed()
at System.IO.MemoryStream.get_Length()
at Viki.bBase.bnJobArchiver.BoxFilesManager.d__3.MoveNext() in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 896
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at Viki.bBase.bnJobArchiver.BoxFilesManager.<UploadPart>d__9.MoveNext() in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 1120 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult()
at Viki.bBase.bnJobArchiver.BoxFilesManager.d__8.MoveNext() in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 1103
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at Viki.bBase.bnJobArchiver.BoxFilesManager.<UploadSessionAsync>d__7.MoveNext() in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 1011 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult()
at Viki.bBase.bnJobArchiver.BoxFilesManager.d__6.MoveNext() in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 971
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
at System.Threading.Tasks.Task.Wait()
at Viki.bBase.bnJobArchiver.bcBoxDotComArchiver.UploadFile(String destinationPath, String path) in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 414
---> (Inner Exception #0) System.ObjectDisposedException: Cannot access a closed Stream.
at System.IO.__Error.StreamIsClosed()
at System.IO.MemoryStream.get_Length()
at Viki.bBase.bnJobArchiver.BoxFilesManager.d__3.MoveNext() in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 896
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at Viki.bBase.bnJobArchiver.BoxFilesManager.<UploadPart>d__9.MoveNext() in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 1120 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult()
at Viki.bBase.bnJobArchiver.BoxFilesManager.d__8.MoveNext() in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 1103
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at Viki.bBase.bnJobArchiver.BoxFilesManager.<UploadSessionAsync>d__7.MoveNext() in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 1011 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult()
at Viki.bBase.bnJobArchiver.BoxFilesManager.d__6.MoveNext() in C:\Repositories\Main\Common\bBase\bnJobArchiver\bcBoxDotComArchiver.cs:line 971<---