For those getting signal loss - if you have a libre 2 I find the Diabox app far more consistent in staying connected to the sensor than the libre link app. Haven't tried connecting to the reader so can't comment on that.
I still need to activate sensors with the official Abbot app, but have deactivated bluetooth permissions in the libre link app (by withdrawing the app's permission to have access to my location). Once the sensor has been activated for about 12 hours I then connect it to my diabox app. This then gives more freedom I feel, syncing with the sensor to show my glucose values updated every minute on my phone, acting like a CGM with libre 2, and has a greater range of alarm options. I also found it keeps a more stable connection than the libre link app. I get my sensors on prescription so need to manually scan with the libre link app every 8 hours so my hospital team have access to my data (diabox can't sync because Abbott threatened legal action). There are good 'how to' guides on setting up diabox on here, but also on the diabox Facebook page if you want more info.