Rssi connection issues PLEASE HELP!

Hi, I am having issues with the Rssi level on my ring doorbell. The doorbell is no more than 6' from my router, and I have opened the 2.4ghz connection and turned off smart connect. The Rssi when I bring the doorbell inside and reconnect it is perfect, but as soon as I put it back outside it shoots up to - 77 and higher! We live in a fairly new house, so don't have thick brick walls. There are no obstructions between the router and the doorbell either. Any ideas how to rectify this please as we are not getting notifications to our phones until the person has long left the property, even when we are sat at home!