Couple of thing that might help, every couple of months or at first sign of trouble,ie red button logos go missing, black or blue screens, odd hard drive behaviour... Pull the plug out, or just turn off the switch on the socket as i do koz the plugs behind a speaker. Leave it for 30 seconds and turn back on. Leave it till the green power light comes on. And away you go. It just re sets it nothing more.
Every single sky box we ever had has been exactly the same, bugs eventually. From the super fast panasonics of old to new hd boxes. All same ime.
If you want some house keeping for your hard drive, press services, system set up, then 01 select, at the bottom of the installer menu youll see sky+planner re build which will clear all the crap(failed recordings and empty titles, there will be some, press guide, right arrow, then yellow to list these... not the soaps alas) out of your recordings list(recommended), and system reset which will wipe the lot(last resort).
Mine played up last week, re set sorted it.
As said, new higher def epg coming out soon, about time, similar to anytime tv but more so. New card also in post or summat.
Hth