'Frequently' ... Sorry not any more...
'Occasionally' .. Certainly...
I have to say I feel windows update gets called as the boggieman far too often like cakewalk being blamed for dodgy plugins. This only serves to dissuade people from using windows update which on the whole is a good thing.
Yup rolling back to restore point is a possibility however from OP's symptoms I'm not convinced Windows update is necessarily the issue (no need to disagree with me btw, I'm NOT saying it isn't a windows update patch either as there's not enough info). Windows event viewer may shed some light and some answers on #2 would be good...
Cheers...