I would try a few things first before you throw it off as a loss.
- Change the Batteries
- Reposition IR receiver
- make sure the keyboard doesn't move while typing
- test to see if this happens to the same keys over and over, or just any key
Test the keys so you know it isn't something like a sticky key or something easy like that, but if none of these works, then maybe somebody else here could help. Those are the only things I can think of at the moment.