Anyone have any issues running 20 miners on one controller. I have an issue where a miner or two will drop out of cgminer and then occasionally pop in and out but never resume hashing unless I physically reboot the miner  Not sure if this a hardware issue with the miner or a stability issue with the controller/auc. I know another user here says he can’t run the full 20 and keeps the number per controller low for stability reasons. Any seen this too and know what it is?