Doing some more tests I first have found that it will not save any crash logs.
It seems to be related to the HD channels, in my case BBC1 HD, BBC2 HD and ITV1 HD.
The crash can happen in two ways.
The BBC box is always the server in this situation.
First scenario
If I have the client box running the British channels from the server and zapping through the channels when I get to a HD channel in my zapping it hangs.
Second scenario
Same as in above except that I change channels on the server box when I get to a HD-channel it hangs, this is only if the client is running channels from the server box, I have only had the client running BBC1 HD in the tests so far.
I will check the tuner configuration and come back tomorrow with that.
Thanks
Jan