Hey, just made an account for this as a quick google search brought me here.
I had been having the same issue, the Kbox 70 was always reading Temp High, and also often asking if I had put on a new atomizer.
It was really getting annoying after 1-2 weeks of having the issue, but I fixed it just by giving the insides a clean.
• Power off your Kbox
• Unscrew the top and carefully pull out the batteries
• Give it a good wipe down, in and around the batteries and wiring with a q-tip
• Give it a blow inside to get any dust or dirt you couldn't get with the q-tip
• Reinsert the batteries in to the box
Worked for me, absolutely no issues anymore. Can't believe it just needed a clean. Hope the same works for others.