Have you tried increasing cpu utilization on the client that’s having issues?
We’ve had some clients with issues downloading large files, they also stop writing data to the log file, and will not respond to a refresh. In our case the download is about .5GB and some clients will appear to be frozen for about 20 minutes.
I believe the client is working on calculating the hash value of that download, since we upgraded to 9.2.5, when they get to that state they ignore any other request. If you up the CPU constraints your clients should be able to calculate that hash value quicker.
See this thread and vote for my RFE.