Our club have a node on a quantar 900 mhz on top of a mountain (simple USB) . All was working perfectly up to a week after we lost internet on site. went on site loged in the raspberry pi, rebooted same problem. check all connection, every thing was fine. Took the whole thing down the mountain. Connected on the bench. same problem, very low cracky audio. kept every thing powered and just switched the URI for another one that is known to be good. Perfect audio! so I deducted that the URI was bad. removed the uri-x, reconnected to the same usb cable. Again all was fine!
I am flabbergasted. I had connected and disconnected the URI on site. I just did not had one with me.
Could this be a kind of corruption of the USB stack?
Could it be that app_rpt dont like to be unconnected to a network? The outage caused the RPI to loose its IP address as the dhcp server was down.
Any hint would be welcome.