My Mouse seems to loose sync from the receiver also, I agree, sync'ing them time after time is is very annoying. I came from a previous desktop set which worked perfectly. I only bought a new set to get a brand new keyboard, the old one got a hiding from 4 years of relentless coding.. and now I have to reset my mouse every few minutes. Im pretty sure the drivers would be compatible, if not exactly the same to what I had working for the previous set so I'm thinking it's a hardware issue.. mouse is farked. That's only my thoughts from what i've experienced so far. Geezuz.. by this point of my typing/explaining.. i had to reset it again! - ffs!!! Shouldn't we be getting a replacement mouse / desktop set? Very annoyed.