Despite several conversations with Sony and further emails to
christopher.bowen@eu.sony.com this issue remains unresolved.
The problem is that affected models like my KDL-37EX403 will power off and on again when watching certain UK FreeView channels. The TV will reboot when either watching the channel or moving from the channel to another channel. This was first noticed on 4Music - Sony provided a firmware upgrade PKG4.117EUL-0108 which stopped this happening on 4Music.
BUT it is STILL happening on mainstream channels like RT, E4+1 and 4Seven - it also happens on many of the streamed Freeview MHEG-IC channels 225 - 236.
The issue is related to the network functionality of the TV because if you disconnect the network cable or disable WiFi - the TV does not reboot when viewing any of these channels.
Sony's support staff seem unable to help and repeatedly ask me to factory reset my TV and question my network setup or even suggest I just disconnect the network cable.
This is intolerable, clearly Sony do not care about this issue and wish to ignore it.