Like John said, if you're using the rechargable battery and docking station, that's the first thing to check. Substitute some fresh AAA's in place of the rechargable and see if the problem continues. If not, probably time to replace the recharable. If it does, the remote is probably dying a slow death.

These remotes are suseptible to temperature. Note how the screen darkens after you hold it in your hand for awhile. What you describe is excessive however.