I've had a couple failures of the microswitch which activates the recoil on the Asiatam recoil units for the Tiger I, Panzer III and Torro King Tiger, that's this little blighter:
The recoil doesn't reset, it just keeps going, your King Tiger 88mm L70 turns into a machine gun!

However it is pretty easy to fix if you can find a replacement switch, after a bit of a search I have found you can buy them from Radio Spares (uk.rs-online.com), part number 682-2326, £4.42 for a pack of 5.

Happy days, King Tiger now back to normal behaviour!