mmh we don't see gpu temps here , and 70° is it on junction temp or basic gpu temp ? if it's not on junction temps then you should check your air flow in the computer case
try to check junction temps while playing ... but even with high junction temps to 110 gpu should start to throttle not crash ...
try maybe some gpu underclock / undervolt a little to see if behaviour is different ...
i think these game crash could even come from a ram setting problem (not vram , but ram) , try put you ram to default (no xmp..(don't remember what is the name of amd xmp option..)), may be even from a weak psu , but i think it would crash the computer enterily if it was the psu ..
the first thing to do when you have problems, is check that everything is up to date, and set everything to default and see if it still crash while checking every temps (use adrenalin "superposition" to display info while gaming)