When I flashed new firmware I noticed double digit hash rates and increase in HW errors. I alerted bitmaintech and they told me to remover clock settings and reapply the firmware. Did you try reinstalling firmware after reverting settings?
yes I think I have tried everything and still the problem after 6 hours of work down 60GH / S, so as bitmain has not solved the beug I'll stay on the firmware antMiner_S320140811.bin