Troubleshooting S17 pro miner

Hi all,

Got a S17 that is acting up. For some reason it reboots every 3 minutes.
Nothing obvious at fault here. no issues in system logs etc
I’m running the awesome miner os with clock set at 550 mhz @ 17.8 volts
Miner is basically outside but under cover in 40 degree temp.

Any Ideas? thanks