Mouse / system pauses when caching in 25.1.0 - anyone else?!!

I have a threadipper machine with 128Gb of fast memory and over 1Tb M.2 fast disc cache.
Graphics drivers are up-to-date and so is AE.

It's driving me mad that whenever AE starts to cache to memory (green line) my mouse and system pause on and off, stopping me working. It's new and very annoying.

Adobe Help!