Thanks for the expert advice.

I think I will set the Target temperature lower and see if that keeps it from changing the tune.

I agree the Noctua fans are quieter but the stock fans are good enough for me if they stay under 10%.  

Wumbo

I'd let it run for at least 24 hours before thinking anything of it 

How many tuning Iterations should one expect?

I am up to 25 Iterations at the moment

bitcoin

S9 Miner Troubleshooting - Fan surge to 100% and Temapture readings stop

Braiins takes a while to tune. If ambient temps change, it may either start retuning or change tuning profiles, hence what appears to be a restart. 

There are Noctua fans you can buy for way too much on Amazon which are significantly quieter. 