Mouse and Keyboard become unresponsive

[Fragtagonal]

I have a Logitech® Cordless Click!™ Plus Optical Mouse and Keyboard on my computer and as of late, only during games like Half-Life 2, it has begun to completely stop working. For about 5 seconds the keyboard and mouse will not work at all and then they will start again. I had the same problem about two years ago when I had city of heroes, but I don't remember how I sorted it out.
Please help,
Fragtagonal

[Fragtagonal]

Update: It actually gets better if I move the keyboard really close to the signal emitter thing that the mouse charges in

[not important]

Is there any objects blocking the path from the wireless devices to the receiver? Are your batteries good?