Ring Wired doorbell offline - Code: P1-74

Hi all, In the past two days, my Ring Wired doorbell has gone "offline" twice. The app requests that we restart the WiFi or enter the 5 digit code, found underneath the QR code to begin the reconnection process. We have never had this issue before, and our current WiFi setup has not changed, nor have we experienced any power cuts etc. The doorbell is hardwired on it's own fuse/breaker and is paired with a Ring Chime Pro and Ring transformer. The unit(s) have been fitted for one year. We haven't had any issues with our WiFi so it's seems unlikely that is is our internet, however, we have restarted the router (as requested) but the "offline" issue has occurred once again. Clearly restarting the WiFi is not resolving the issue. I am yet to reconnect the device using the QR code/5 digit code; I intend to try that "fix" today. Any ideas? Thanks in advance. **Edit: taken from device health: - Transformer voltage: Good - Last reported signal strength: RSSI-71 - Status: Offline - Firmware: Up to date Looking at the RSSI help section, it appears that anything between -60 to -90 is considered "critical" and functionality will be affected. I'm unsure as to why this would now be occuring at the doorbell is directly below our home office where the router is located. We typically get -40 to -50 RSSI.**