Is it possible to lose a single transponder on an LNB?

I can't get 11053 H on 28.2 - was watching it and I suddenly got a tune failed. Does it on both tuner A & tuner B on my fixed dish. Works fine on my motorised dish though.

I've checked all the channels on that transponder and I can't get any of them - checked other horizontal transponders and they are ok.

The fixed dish and LNB are less than 12 months old.