Re: Broadcast EPGs
That's just nonsense. An EPG should be trivial to standardise and extend in such a way that boxes that met the standard don't get upset by new extensions. Just basic checksumming on the EPG should be fine to cope with poor signal, as if it's got an invalid block of EPG data it can just throw it away and wait for it to be resent. If your signal's that crap, you'll be complaining about the lack of picture...
I'm a very happy humax user, and have never had any problems with EPG on either freeview or freesat. Seriously, why would you want the EPG to come from anywhere else other than inline with the content?
As for frozen update screens... That just seems to be random finger pointing, as it's not a general problem with set top boxes, and is surely unrelated to PSU issues.