I was recently troubleshooting a device that suddenly started cutting a minute or so off the start of some recordings.

There appears to be about a 2 minute time difference between the 2 Freeview transponders 12456 and 12483.

The time broadcast by 12483 seems to be more or less accurate, with the time broadcast by 12456 about 2 minutes slow.

Can anyone else confirm this behaviour?

Who controls the transponder time - Freeview, or the broadcaster?