Windows 7 - Microsoft USB Mobile Mouse 3000 Nano: periodic lag problem.

Hai,

Yesterday I decided to get a wireless mouse cause my desk is so full of junk that the cable kept getting stuck in everything...

So naturally I went for Microsoft hardware (only ones that never broke, heh, two year record on keyboard), and got a Mobile Mouse 3000. It worked perfectly the 1st day I got it, but today I seem to be getting cursor lag and movement delay from time to time (the intervals aren't even).

It happens in every single application. Games, desktop, internet browser, etc...

I have a two year warranty but Romanians get kinda' edgy when it comes to warranty, I'd rather keep that as a last resort. Could it be software related? Something I can fix myself? I searched for a driver on Microsoft Hardware but I couldn't find one. Also tried changing the cursor sensitivity from Control Panel...

What else umm... the battery is Duracell, came included with the product. And that's pretty much it... didn't smash it against the wall or anything (yet).

Any ideas?

EDIT: The green light in this image isn't lit on my mouse, just thought I'd mention it:

Green light indicates a good battery, without it your battery may be weak or dead.

So if it's not lit, my battery is failing?

Hmm well the battery did come in the box, could be old or faulty... I'll try several and get back to ya. Thanks.

I tried two batteries, both from different manufacturers and stores... the light only stays on a few seconds after I put in the battery, and the cursor still lags...

EDIT: Bad news is I can't seem to unplug the mouse USB cause it's too small for me to even grab XD Minimalist technology be damned...