OK.
You could try opening phone settings (looks like a little cog icon, top right when sliding down the notification & user panel on the Home Screen .) find apps, scroll down & find Librelink in the list. Tap that find storage & you should get 2 options at the bottom “clear data” & “clear cache.?” Try just clearing the cache..
I would be look into any unwanted open apps running in the background, too?
I’d possibly restart the phone after..
You may need to NFC rescan your sensor once done to reconnect & backfill a few minutes of data.
Hopefully it should prevent your app freezing when you try to open logbook?
try this at your own risk. Hopefully it will improve performance?
Hopefully, someone else has ideas, too?