Stick Up Cam - Weak Signal/No Live View

I'm looking for help!I've owned a Ring Doorbell for a while now and loved it, it's worked an absolute treat and because of that I decided to invest in one of the new gen Stick Up Cam's with the Solar Panel. It's currently mounted to the side of my new build property and worked somewhat well after being installed. I have BT Super Fast Fibre, with my router located in my understair cupboard where the fibre comes into the property. After only a few days of being installed, the RSSI score started to rocket to the point where it dropped off my home network. I've invested in a WiFi Extender, which is now plugged into a power just the other side of the wall in the nearest bedroom and it's connected up fine. I managed to get Live View worked for all of about 6 hours, before it's decided to show weak signal and suggests my phone's connection is weak. I've tried restarting my router and number numerous speed tests through the Ring app and I have a tonne more than the recommended connection speed.Please could someone help me try and get this current wall decoration working?