Ever since we bought the TV (KD-55S8505C) we've had issues with the touchpad remote!

It used to be every now and again but lately it constantly does not work.  I have been through the reset procedure (Holding volumn down + on/off + touchpad) and re paired to the TV.  It will then work for a while, literally maybe a few minutes or hours, then stops working again.

Extremely frustrating and was wondering whether anyone knew of an issue or of a fix?