Our now 18 year old Metz with satellite tuner does that during the night (or did, i'm rarely awake at that time anymore

) to update the EPG with info that is, or was, broadcast on a special channel.
Well, it does not flicker, but when it's in standby, with it's red LED, the LED turns greens, as if it was turned on. Stays green for a couple of minutes, then goes red again.
But the EPG is broken for quite some time now (we don't use it anyway), so they might have stopped broadcasting the data, at least in a format compatible with the TV.
This TV is way older than current "smart" technology, it's not even Full HD yet.