My sp30 runs better at 21c then it does at 0 or 10c

I updated mine and they restarted at 1330W, I'm at 240V,  My cores 0 1 2 15 16 17 did not work before or after the update, they have not worked since I received the unit 4 days ago. Running at 4000 gh but stable. They told me to do a 30 second power down after the update.