I'm using an EVGA SuperNova 750W G2 so I don't think it's the psu.
I'm at 0.0133%/0.0138% error rate currently with 49C/51C temperatures.
0.013% is very low error rate. (granted, its higher than the 0.0008-0.003% usually seen in the S5)
as suggested by phillipma, if the error rate doesnt increase over time theres really no concern. 0.013% is pretty insignificant, its a difference of pennies/month at the most
What's the latency to the pool? Ping comes back high 100's may want to switch.
Latency won't have an impact on hardware errors, but will do so on stale shares.
I am using GPRS mobile connection with 300-800ms delays without any trouble. Almost no stale shares. Using high diff to keep GPRS 32kbits connection alive.
Sounds about right. When one of my laptops drops off the internet, I can submit shares quite a bit later and still come through as valid.