It seems as though it is confined to the Zergpool Pool at this time. I let it run overnight with Zergpool disabled and didn't have any issues. I enabled Zergpool this morning and right away I had a couple GPUs switch to Zergpool after a few minutes they switched to a different algorithm on Zergpool and stopped mining. I disabled Zergpool again, and all is working fine. So, it seems Zergpool isn't working too well for me.
I will test that pool as soon as I can to see if I can reproduce the issue. Aside from communication errors, I am not sure what the issue might be as the only difference to the software is the pools stratum server url. I am currently testing a fix for disabling specific algorithms on MiningPoolHub. If any adjustments are needed for Zergpool, Ill include them with that fix in 1.9.1