Why is my Masthead being written to .tmp files under the BES Server folder?

Ok this is STRANGE.
Windows server running v10.0.5 btw.
I have +14k .tmp files in my BES Server folder. There are constant new tmp files being created and destroyed. I can see them apear/disappear every 5-10 seconds.

When I opened several of the “abandoned” .tmp files, they all appear to be my Masthead. What would be causing my masthead file to be constantly rewritten/replaced like this?

my 2 cent … Would suggest to review the AV exclusion ( the same for other applications like Splunk, Sentinel, Carbon Black, CrowdStrike … ), should be the reason of the existence of ‘abandoned’ temporary files.

Procmon https://learn.microsoft.com/en-us/sysinternals/downloads/procmon could help for this purpose, but can be also useful to identify the origin of these temporary files ( server? agent? … )