Only key issues I have is not having enough decent weather to use my key!
I'd guess if you don't see it sticking a bit or transmitting its time for a new key. Ug, not cheap.
'04 Boxster S 50 Jarhe 550 Spyder Special Edition 851 of 1953 made, 3.2L, 6-speed manual short-throw
'Cause you know the Germans make good stuff!!