try taking it apart - then find one of those pensils that have a rubber on the end ......... use that rubber to clean the contacts on both sides of the key-case ...... i find it often works to get a remote working again (no idea why any other rubber doesnt seem to work, but the one on the pensil can be spun around quickly between your fingers and may actually clean much deeper than other methods) ..... & yes i agree - sounds daft, but it actually works !