about a month ago I got a used S7 that has run ok for now. However i've had to reboot a couple of times and I suspect it's because it went over 80C and stopped.

I check the board temperatures and one is running at 70-71C while the other two boards are running at 62-63C. Could this be an indication the miner needs a dustoff ? I'm running it next to an S5 (about 4 inches apart) so my other thought is that maybe the S5 is generating heat that is conducting to the S7 board closest to it. The S5 boards are running at 56-65C.

Thank you for any help you can provide.