Plasma crashes

Is just me getting Plasma problems since recent updates?

I apply Fedora updates once a week and since last week I'm getting
frequent (only something like once a day) problems.

I've had a couple of total hangs, I think these were linked to viewing
a website that has a particularly active js header in FireFox, though
to be fair that might be 'cos it turned out I also had 90 other tabs
open.

Other than that I seem to get a "race condition", my auto-hiding
control bar sometimes shows a flickering tooltip, nothing seems to fix
that other than closing the session (log off or reboot). I've just had
a screen corruption, the right hand side (15%?) got a portion of some
other page fixed on it, changing virtual desktop fixed that.

This is new since last week.

Mark
F39, X11.