Never on my DAW but it kept happening on my internet PC!
After much re-setting, re-installing and forum searching I did eventually find a little script file that fixed it perfectly but soon after that my SSD died taking that file with it.
The issue hasn’t resurfaced since so I haven’t tried to re-find it.
I’ll take a look at some search results a bit later and see if anything rings a bell…there were a lot of bits of advice and reg-edits I tried before finding this that did not work!!
Thanks for all the responses.
That fix I’m using is temporary & I’m finding other Cubase presets getting deleted as well.
If there’s any other possible solutions or it gets ever fixed please post back.