Chosen Solution

Panasonic RP HD 305 won’t turn on unless it has been recently plugged in. (last 1-2 mins). ( Power button does nothing ) My initial thought was a bad battery, but if turned on and connected to a bluetooth device it plays music for hours. If i turn it on and let it sit without connecting it it eventually becomes unresponsive. I have tried a hard reset ( pairing mode, then holding + and _ volumes button at the same time for 5 seconds) any idea what this could be?

I think it’s a very natural habit, if your device is on and not connected to anything then it will shut down to save energy.