s pen haywire

Hi. My previous Note overheated and died when charging. I bought a Note 10 to replace - on ebay, as skint. THe S pen with it will type ok for a few letters only, then does nothing. The s pen from my previous note works properly, but dosnt fit in the phone. I bought another s pen, but that goes haywire, picking up letters at random so every other letter typed is wrong. I ve tried various solutions from web, but no joy.

Any  one experienced this and found an answer?

Thanks.