Temp was between 60 & 70 C while the game was running. Which seems hot to me. I guess I will pick up a cooling tray!
Typically problems don't start to 80c, but there's certainly no harm if getting better cooling! If this is a laptop, make sure all its air vents are free of dist - use a compressed air can to blow them out.
If there are no mods in use now, that error log shows a definite problem. Please do a full **clean** re-install:
- move any valued save games elsewhere, and user_empire_designs.txt from /Documents/Paradox Interactive/Stellaris/ if you have made any custom empires or races.
- "uninstall" in Steam-Stellaris
- manually delete both the Steam/SteamApps/common/Stellaris AND Documents/Paradox Interactive/Stellaris folders
In particular you need to make sure there are no files or folders left under either the Steam Stellaris or Documents Stellaris locations, before installing again.
- re-install game in Steam, run a Steam Verify when done.
- add stellaris.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.
- start the game with no mods active and test with a new galaxy - NOT any existing one
Let us know if that helps.