my kryptview a780 has not worked properly for weeks now. it will only allow to watch basic channels such as bbc and itv , channel 4 , channel 5 , sky news that's about it , it use tp allow everything to watch then went off for days , eventually when it came back on I love all sports channels it would only allow no sky sports only sky sports news but its all gone down now for about 3 weeks, ive tried everything , switching on and off at back and sockets , it wont allow software updates nothing happens at all , where as it use to update , tried doing automatic searches but to no avail , ive tried everyday for weeks . please can anyone help so I can get everything back again