Happened again last night, off out today but had a few mins to tinker this morn. Changed sat tuner to single rather than equal to and turned on show message when starting recording before trying to recreate problem. Successfully did so, watching BBC 1 London with timers set for Channel 5 HD and BBC 1 HD using just sat tuners. Box hung with no message to say recording was due to start. Was able to use Dreaboxedit to restart box so does this mean just the GUI was frozen?
I changed the skin to test it wasn't that and again successfully froze box with no message using same channels. Did the same a third time but watched a Freeview channel, again no message but box did not freeze this time (expected as not all tuners needed were in use). Tried recording a Freeview channel using the C tuner DVB-T2 whilst watching another Freeview channel, received a message that a recording was about to start and that service had been changed to the recording channel. I guess this is what should happen when using both sat tuners but it seems to be ignoring the settings when both in use.
Did it one last time, watching a sat channel and recording another and got a message to say a recording was starting. Could it be a bug?