I don't know what-all you've checked. So I'll start with what I would do to try to identify the problem:
1) Are the batteries in the remote good, or do they need to be replaced?
2) How do you know the remote is transmitting, and that the receiver is not responding? Could it be that the remote is not actually sending out a signal?
3) Many times I've found that the selector buttons on remotes need to have their electrical contacts cleaned to resume normal function. Do you have any electronic repair experience, or tinkering skills?
4) Have you dropped the remote recently, and suspect physical internal damage?
5) If you are certain for some reason that the remote is operating properly, there is a good chance that you are
correct in believing that the receiver has a reception problem, and the receiver might need repair.
6) Do you own this unit, or is it provided by some commercial service provider who has a replacement policy?
7) Is the unit new enough to still be under some manufacturer warranty, if you personally own it?
8) Are the cable hook-ups from the receiver to your television securely attached (not loose or disconnected if you moved something recently)?
9)The most often thing I've encountered with remotes, is that the batteries themselves can become ajar within the
remote battery compartment. Open it up, and reseat the batteries, and try the remote operation again.
Good luck with this maybe being something simple. Contact us again if you still have a problem, but please be specific with what you've done, and what is happening.