Probably the problem is about your fans.One or two of them may be working not working or with lower performance.
Pls. check the fan speed with eye inspection.Switch fans with working miners.If not solved pls give feedback.
I can attest to that, your fans can cause your s7 miner to freak out. Sometimes they may seem like they're working right but they're not.
Do an eye inspection to see if both are spinning at the same speeds and so check out the speeds in your miner status. They should be both at around the same speed which is >3000