This problem I was having after waking up from suspend to RAM. Every time I 
wake up the machine from sleeping to RAM I get the following message:
"Gestor de ventanas KWin
Desktop effects were restarted due to a graphics reset"

Related but in 16.04

Apparently currently blinks/flickers on decorator windows are gone, but
I still get that message every time I wake up from suspend to RAM.

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  [Kubuntu 18.04] Blinks in title bar of the Brisa window decorator

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