Hauppauge PVR350 problem

[metropole]

I recently upgraded from a 250 to a 350 to get the video out.
The 250 worked without a problem.
With the 350 I have a problem:
From time to time when I switch channels the TV viewer locks up, on the video out I get white and red stripes.

Did anybody encounter a problem with the 250/350 to switch channels?

An unrelated question for the Hauppauge IR:
I can do everything from the remote except starting the TV app. Why is that?

[metropole]

I got the PVR Beta and it works now.
However I get now an anoying clivk on the audio out.