Hibernate, resume stopped working

Resume from hibernation suddenly stopped working a few days ago.
MATE 20.04

Worked perfect since installing way back in time..
Any tips? Where to start looking?

Probably kernel related i guess. At least i have seen such reports more often after a new kernel was updated. Correct me if i'm wrong since i never used hibernation myself.

You may be right. But if I boot with another kernel I still have the same problem.

I searched on the term "ubuntu 20.04: hibernation stopped working" and got the following:

These should provide the kind of information that could prove helpful. Good luck Tjobing.

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Well, this issue (I think) fixed itself. Resume from hibernate suddenly worked perfect again.