Welcome to the Forum
I suspect it is not your remote that has stopped working.
Was informed an hour ago of a possible problem, and have been working on it.
So far have this to report - boxes appear to lock up if using software version 1.00.19 or earlier, now trying to establish which mux/channel is causing it.
Watch this space.
OK not going to be able to tie it down to a channel or mux as it happens on a few.
For the OP
What model of PVR and what version of software does your unit have on board...if it locks to quickly for you to check, then disconnect aerial, and try.
The bottom line for anyone with the problem is to update software to latest versions. 9300 latest is on air now.