sounds familiar.
i leave my computer running for several day’s with open applications al the time. it goes to hybernate, sleepmode. have ssd so it’s qiuck awake.
it happens not repeatedly more one’s or twice. too less to get annoyed by.
It seems to get stuck by blocked cache or something.
I left a batch of images exporting to disk overnight … coming back to PL this morning, I find that access to Local adjustment tools is lost (as described above, the tool interface is not visible).
Stopping and restarting PL clears the problem. Returning to the image last accessed with Local adjustments I can now see the results of my various attempts to apply different Local adjustment tools (which I could not see at the time).