Question Sound disappear when playing/Keyboard doesn't work

Feb 6, 2019
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Hello everyone
I noticed that in the start (after ~ 5 minutes) of "heavy" games (e.g. kingdom deliverance, the witcher 3) the sound completely disappears then he can appear again in random situations. It happen now with recently bought R9 290 graphic card, (upgraded from GTX 660). Moreover the keyboard stuck most of the time.
GPU temperature is always under 75C but CPU can reach even 85C (rarely and not imminently) . Windows fully updated and so on the GPU drivers.
What could it be?

Core i7 -4770k
PSU VP550P antec
16 GB ram
 
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