Shell swap now not turning on
So I did a shell swap for the first time yesterday and after everything was moved over I turned it on and it started fine. I used it for maybe 30 min then put it to sleep while I was doing something else. When I came back it would not turn on and the top led would just slowly blink. I left it charging over night and nothing changed. I read online to let the battery drain so I left it unplugged while the light blinked and after a few hours it just turned on and said it had 99% battery. I used it for a little while then while I was playing a game it just turned off. The fan was still running but everything else just shut down. I have tried holding down volume down and the … button and doing the same with volume up and nothing is happening. Sometimes I can get the led to flash quickly but most of the time it either flashes slowly or not at all. Please give me some guidance if anyone has advice. Thanks in advance.
Edit: Thanks for all your help. Nothing suggested fixed the issue so I ended up contacting valve support and I sent it out for rma. Thanks again everyone!