When I plug my Life Q20 headphones into my computer to charge (instead of into a wall charger), it seems that they charge just fine. However, approximately every 30 seconds, Windows plays the “USB device connected” sound, then pops up an error message that says “USB device not recognized”. After showing that message for a few seconds, the “USB device disconnected” tone plays, and the message disappears.
Is this normal? Will it break the headphones (or the computer) if I keep charging them this way?