Ring Doorbell 3 Suddenly not working with poor wifi message

I bought a Ring video doorbell 3 on 14 August & it has been working fine upto now. In the last few days it's stopped working, giving off a message about poor wifi connection. When I click on Device Health it shows RSSI-74. However if I stand next to it & do the speed test on my phone I get Download 17.4mbs, Upload 7.05mps & Ping 25ms. I managed to get it working again yesterday by taking out thh battery & putting it back again. The only thing that I can thing of is that it has rained heavily leading up to it not working. I know that should make no difference, but I have not done anything to the Router or had any issues with my Virgin wifi, & all other wifi products are connecting fine. Thank you