Something very strange happened to my 580 card used on my PC with Windows 10. After the last restart, the hashrate dropped from 32 to 26 Mh. Neither Radeon settings nor Windows has any updates, since I turned them off. It is in compute mode. It seems the problem is that suddenly the -strap X option on Claymore wich I used together with phoenix miner doesn't increase the hashrate. On the contrary, after successful loading it reduces it with 1Mh at least. I tried switching off the PC, but nothing changed. Weird...