My main Surface Pro 3 is also finished. The charging light won't come on and I can't charge it. So in one month, I've had three malfunctions. I think I'll be able to get by if I get a ThinkPad x260 in advance. However, it was a mistake to have a SIM slot but no board or wires. The fact that the staff didn't even know about it is a bit strange for a store to sell it. I replaced the memory and SSD and it did speed up. I replaced the board on the wireless one, but I don't know how effective it is. There are a lot of things I don't know.