Aurora r4 overheating

Hi all,

During winter time I never had problems with heat but now that it is hotter in the room my pc gives me blue screens, shut down etc....it took me a while to realise it was a heat problem because in 26 years of pc it never happened.
I checked all fans, they are fine blew compressed air to remove dust (to my opinion there was not that much dust) I checked heat and it is in the 40c range, cpu seemed ok and I do not play heavy games if any at all.
Thanks for the advice.

Claude