I have a 9300T and a HDR Fox T2 and a TV sharing a common aerial, which loops through the Fox, then the 9300, then the TV. All have been working fine since installation - several years for the 9300, just over a year for the Fox. Both Humax boxes are tuned manually to my local transmitter (Hannington, 4 miles away and in line-of-sight). There are no channels above 800 on either box. A couple of weeks ago I started to experience picture freeze and breakup on BBC channels on the 9300. The breakup affects live viewing and also recordings made since the problem began (but does not affect earlier recordings). Manual retune does not cure the problem. The Fox is unaffected, and continues to show and record programs on the PSB1 multiplex without any problems - as does the TV with its own internal Freeview tuner. Of course I've checked all connections and cables. To make sure that I was not seeing intermittent loss of signal from the aerial I connected a second TV to the 9300, so that I could check both Humaxes at the same time. The breakup happens on the 9300, while the Fox is still showing a clear picture. I checked signal strength on both boxes at the same time, and notice that the Fox reports 100% quality, while the 9300 varies between 0%, 40% and 100% in a repeating cycle of a minute or so. Signal strength is at the usual for both boxes. There is also a similar problem, though much less severe, with the COM6 multiplex. All the other multiplexes are fine. I'm assuming that this is a faulty tuner - but why would this affect only one multiplex?