Screen blanking when changing volume (triples and new Nvidia drivers)

[Lizard Of Bodom]

Hi all
Wondering if anyone notice similar issue - ever sinve recent driver update for Nvidia I am experiencing odd issue - when changing volume using keyboard volume control, screens go blank/black for few seconds. Happens only on triple setup with nvidia surround, doesnt happen on single FHD screen.
Prior to driver update I only had an issiue of FPS lowering down drastically when doing it, but now it actually goes blank for a while.
It looks like its connected to that windows overlay widget (when changing volume you can see overlay of volume control on upper left corner, W10 specific) but disabling it didnt help (it only hides it but I guess its still "active").
Also happens on other games now so its not AC specific, but thought I may ask here as lots of ppl would use triples like me.

R3700X+16GBRAM+980SLI (maybe its SLI issue?)....

any pointers appreciated.