Hi guys, im pretty new to the mining scene.

I just invested in a rig with 3 1080 gtx and when i open ewbf to mine BTG i notice that in the first 10 minutes it can accept 500 shares per GPU and as soon as a new work appears the share accepted rate is like 500 accepted shares per 2 hours or something. It slows way down. If i restart the miner it goes to 500 shares per 10 minutes again until it finds a new work again. What is up with this? What can i do about it? Is it normal? PLz help