Re: Claymore's Dual Ethereum AMD+NVIDIA GPU Miner v15.0 (Windows/Linux)
Hello! Since yesterday my ether rigg (6x AMD RX 580 8gb) has gone down from 174mhz (29mhz per gpu) to 60mhz (10mhz per gpu) .... does anyone know why it may be? 
Are you using Windows 10? Then most likely it was some forced Windows update which included new drivers for your AMD GPUs. I ran into this problem a few times in the past. It would either not hash at all because all the overclocking settings were reset OR it would hash at a slow speed because compute mode was disabled by default.
It was a pain in the butt to disable but somehow with some reg hack I was able to prevent any updates from happening again. Search the web and there is a guide on how to disable Windows 10 updates. Its pretty indepth and you need to block access to certain DNS hosts.
You should look at WUB ( Windows Update Blocker) - please don t take it as AD. Ive myself lost alot of nerv trying to stop this mindfk.... feathure to shut up. Schedules cripts , disabling servicers , LTSB ver. and etc and etc.
Then i found this tool. You could enable WU any time to install update like .NET framework if needed. Then shut the f. WU again in one click.