I would like to ask if anyone is experiencing a larger percentage of stale shares lately?  My effective hashrate has dropped and stale shares at around 7%. I'm on ethermine pool mining ETH only.

My setup:
12 pcs of Sapphire Nitro+ RX570 8GB with custom memshift BIOS
GPU Clock at 1150MHz 800mV
Memory Clock at 2190MHz 850mV
PhoenixMiner 2.7a