Ring doorbell 3 Plus connection issue

My Ring 3 plus door bell is on battery power, linked to my fibre broadband via a Ring Chime Pro. Now my Chime Pro sits about 30cm away from my BB router and is always a low RSSI 40. My doorbell is the only thing connected to my Chime Pro & sits about 3 meters away on the other side of the external wall from my Chime Pro. The major issue I am having is that the doorbell constantly loses WIFI connection & stops operating! The last health check states the doorbell was at RSSI 59 when it lost connection! And battery power was at 93%. Why is this repeatedly happening?? My broadband is solid with very good fibre speeds!!