Bluetooth App stopped working overnight

I have been experimenting with a Bluetooth App that connects with an Adafruit Feather board. I found an example on which was working fine for several days.
But overnight it has stopped working and gets stuck during scanning.
I have tried re-building, deploying on different phones, etc
Has anyone seen this before?


Hi Mark

Well, if it was working for several days but has since stopped, that is most likely the hardware and since scanning is now failing, the Adafruit is the main suspect. Was there an environmental change of some sort around the hardware? A power surge or outage? Has it been moved to a different location?

Battery or EMF interference?