Dropping wifi all the time!

My ring doorbell started off fine but now drops internet all the time. I'm at my wits end and am about to throw the £160 down the drain! I've restarted EVERYTHING time and time again. It has a plug and is connected to the mains so I know it has power. The wifi signal on the app says 'good'. I restart everything - reconnect and it stays anywhere from 1 minute to a few days and then goes again. Nothing has changed in the house and all other devices are running fine. It's been 'offline' for nearly 2 weeks now. It decided to connect at 5am this morning but went off again at 8. I don't know what else to do.