I had a similar issue that was intermittent. Every time I went there it worked fine. After several weeks we found a Lurton Homeworks interactive wired dimmer that was going bad and would emit enough RF to make all the URC remotes in the house stop working.

Found this because one day it was acting up when we were there. Started shutting off breakers in the house to pin point the issue. Replaced the dimmer and problems went away.