My dongle has lost touch with my router and is flashing continually. This isn’t the first time and any advise would be appreciated
Maybe a weak signal from the Wi-Fi? Some installers fit a Wi-Fi repeater where the signal is poor, around half way between router and dongle is a start point
You could get an indication of signal strengths using a phone WiFi app. There are many. The one I use is WIFIAnalyzer (open-source) from vrem software if it helps to narrow the search on the App Store.
Note: When (re) connecting to a new WiFi it is almost certain that turning off everything other than the 2.4 GHz signal from your router will make connecting easier - or even possible.