I’ve got Chuwi UBookX 12 inch 64GB with the keyboard on March and now it’s just didn’t charge. The tablet turned off sometimes it shows only red led while connecting with charger or no light at all.
I’d guess the battery has deteriorated to the point where it doesn’t hold a charge anymore. You can try and replace it if you have the skills and patience to open it up. Luckily, it’s not that difficult (or expensive) to put in a new battery. 