Guys, lately I've had countless problems with my laptop that don't allow me to work properly on my drawings and commissions, currently what's happening is that no matter what, every time I plug it in to charge it suddenly turns off and I can't continue drawing because if I try to turn it on it keeps turning off over and over again, and some would probably recommend me to just let it charge, but I can't waste 2 and even 4 hours of my time waiting for it to load and do nothing, and what's worse, when it is at 100% it also turns off suddenly and i can't use it until it is less than 70% or 60%, it's so annoying and frustrating! and I do not know what to do

It gives me headaches, and I don't know if the pc is overheating or something else, but I'm fed up, I want to save for a new laptop but at the same time I can't because the one I have doesn't let me work and this is basically a walking circle