Hey, I have had the exact same problem with this machine this week, it’s less than 6 months old and is actually a replacement model that I received due to the first one I bought having the faulty battery levels that others on this forum have reported.
I left it overnight switched off and charging to find it completely dead the following morning.
I followed the rather nonsensical instructions from Gearbest of sending a video of it not turning on, and they have offered me a partial refund of 120USD (I’m not happy considering I paid over 300 for it and it’s had pretty glaring technical issues). PayPal aren’t interested in helping either due to the amount of time that’s elapsed since I bought it.
Are you going to try and repair it or cut your losses? It looks like there’s batteries out there that could work as a replacement (if it’s the battery that’s causing this issue..?)