Why isnt my ue megaboom charging

I've got a UE Megaboom that won't charge. It's up to date, and it will connect to my phone when I'm briefly able to turn it on before it dies. When I plug it in, the LED charging indicator light flashes once and stops. What's happening, and what do I need to do? UE customer support has been no help, and I've plugged and unplugged it probably at least 200 times. I don't think I can reset it because it dies before it does much of anything. It did this once before, but it fixed itself. It's been a few weeks now that it's been stuck like this though, so I'm not very hopefully it'll just resolve.