k20d and metz af-1 58

Hi - ths sounds like a stupid question but I am somehow stuck in technology A few months ago I bought a Metz AF-1 58 for my K20D - The flash worked fine in p-ttl mode and I made good pics. Now I wanted to use it again and somehow the flash is not showing ttl as possible mode and it seems not to communicate with the camera anymore (does not react on zoom changes, does not react on aperture or iso changes and makes no aligned pics. Who knows, how i can re-active the p-ttl mode?

Seems a reset is in order.

Press and hold the mode button for 3 seconds until the text reset is in the display.
After about another 3 seconds the display reverts to default and the flash is back to factory settings.

(Page 115 from the manual)