RSSI is Green but camera quality is poor

Hi, We have had our ring door bell since July. Has worked absolutely fine, friday 15/09 we noticed that it was showing offline. 2 days of trying to reconnect it would not do so. Day three I tried again and it reconnected, however the RSSI was now showing poor despite no change wifi. We had wanted a chime for a while and having read that it was also an extender thought it may help. The RSSI level is showing green for both devices but camera quality is still poor, and to top it off, the door bell wont connect to the chime as an extender as it states the router is too far away. They are connected as works fine when door bell is rung. The wifi router is no more than a meter or two with no restriction. Any help would be appreciated.