Unable to paste a file and upload after running client for several hours

Summary

Unable to paste and upload a file after being connected for a few hours

Environment

• Windows HipChat 4.0.1637
• Mac 4.0.9 (637)

Steps to Reproduce

1. Login to HipChat
2. After several hours try to paste and upload a file

Expected Results

File is uploaded successfully

Actual Results

An error is displayed:

Something went wrong uploading that file.

Workaround

Logout then login again