Ok, tested last night with the MP in debug mode and could cause and register some random failings to tune to channels. It only happens sometimes, about 1 in 10 times. It doesn't matter what channel it is, it fails to tune randomly, this time without any warning or message, just a frozen screen. One time the screen was frozen black (I think from the channel I was on before I tried to tune to the next channel) and one time a frozen epg.
You can still hear your the buttons you hit on the remote and when you hit stop, the screen flashes and MP is 'released' again from it's freeze. Now all the actions you've hit on your remote when it was frozen will take place. Hitting the failing channel after that again and it will always work...
Please be a little bit patient because I forgot to take along the logs on a usb-stick so I can only post these tonight. sorry
Here are the logs I promised!
I hope you guys can make something of it