Graphical glitch in top-left on screen after alt-tab
#1
Hello all. I just did a clean install of Ubuntu 18.04 LTS on a new intel nuc (NUC8I5). 
Almost every time I alt tab away from Kodi and then come back to it (either via alt tabbing again or pressing its icon), a graphical glitch appears in the top left of the screen. Alt tabbing a few more times seems to solve it. I'm pretty sure it's also popped up on its own once too, without alt-tabbing. This happens both with Kodi 17 and 18.
Attaching pic taken with phone, as the glitch does not appear in screencaps.
Image
Log pastebin: 
https://pastebin.com/LV0M4nYA

Any idea what this might be and how to stop it from happening?
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#2
Update: also happens with MPV player, so I guess this isn't a kodi problem but some other problem between my rig and Ubuntu.
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Graphical glitch in top-left on screen after alt-tab0