Ok, I made a quick video illustrating the issue I'm having. P-TTL communication is sporadic on my K-5. When powering on the camera and flash sometimes, P-TTL will not be enabled. When P-TTL is recognized, however, the flash will usually revert back to TTL after a few shots, messing with the zoom, or just letting the camera idle. It's easy to see it on my Metz flash, as it tells you when P-TTL is enabled or not. On a Pentax flash, there's no such indicator, so the only way to know is when the flash ends up firing a single full-power blast instead of the pre-flash+controlled blast.
This happens in both Auto ISO and when an ISO is selected.
Can anyone else with a K-5 and a Metz flash confirm this result?
- Jason
EDIT: I updated to the latest stealth firmware revision and can confirm the problem still exists.