Anyone else getting major rejection rates? I'm mining with cudaminer on some 750ti's and SGMiner 4.1.271 with my 7970. My cudaminer was reporting like 50% accepted and rejected and my sgminer keeps saying things like requested worker restart and very few rejected but the Diff is constantly changing. I normally mine at 650KH/z WU with my 7970 in SGMiner but it's been fluctuating a lot lately and is kind of hanging around 550-600 for some reason.
http://i.imgur.com/0kvSlSK.png