My jam xt was playing fine, but, when I tried to play it today, it wouldn't play. It used to make two sounds for on, and one for off, but, now, only makes one for each. I've tried charging on four different chargers, all known to work, so it must be fully charged. I also tried to pair it again, but get a message on my phone that Jam XT is not in pairing mode, even though the blue light is flashing. Any suggestions?