I don't think this is recomended way to make your situations better, but i just want to report my case as an example.

I used to have the same issue and i could rarely, i don't know what made it work, connect my plane. I tried to turn on the app, searching, shut down the app and turn on again, searching......., after a couple of trials, connected!!
Every time this happens.

I opend the white cover of the cockpit struggling sticky glue, found the antenna bended around the circuit chip, straightened it vertically.

It improved the connectivity perfectly.

This could give you guys either the clue or possibility of send your plane to the trush bin.

At least you'll no longer officially supported by manufacturer.

Try at your own risk.

Thanks