r/Ender3V2NEO

Hi all, new to printing and the community here. Picked up a 3 V2 Neo second hand and it has been printing fine until the last week or so. I had issues with the filaments laying down thought it was a nozzle issue but installed new nozzle today and noticed temperatures jumping all over the place during printing. See video during test print. I think this now may be a thermistor issue as temp is no problem when stationary. Can anyone advise the easiest (closest to plug and play fix) for me? Whether it be a new hotend or thermistors? I don't mind upgrading but I want as close as possible to plug and play. Also I am in Europe so if possible please keep this in mind for shipping. TIA