Ring 2 RSSI Signal Degrading After A Few Hours.

Hi, I recently purchased a Ring Video Doorbell 2. My problem is when I first connect it to my internet it works fine, strong signal and RSSI of 50 in green, video works great, sound sounds good, starts fast in live view. However over the course of a few hours the performance drops, video gets choppy, sometimes live view won't start etc. I check the device health and the RSSI has gone up to 60-70, so I reconnect it to my internet again through the ring app and press the button on the ring. It connects and it's working fine again, RSSI is back to 50 and everything is smooth, however after a few hours it degrades again. Does anyone know the reason for this? I am using a D-link DIR-3040 router and D-Link DAP-1820 extender, the router is not far from the front door maybe 10-15 feet and the range extender is on the other side of the wall, the signals are reported strong all green bars, I am also using smart connect in the router setup no issues with any of my other wireless devices. I also noticed there is DHCP and Static options under advanced setting during the internet setup on the ring, does that matter? I've read quite a few ring help articles about connections and nothing seems to be working, is it the ring device itself or my router? is there any router or other settings I can try? Any help would be appreciated. Thanks.