I recently had a similar issue with my XC70. A mechanic suggested that a dying battery might be the culprit. So, I put in a new battery and the key fob problem went away.

I have this problem too (with my '08 XC70).

May I ask if you were able to solve the problem, and if so, how?

The windshield washer fluid reservoir on my 2008 XC70 is leaking. Can anyone recommend the best way to get at the reservoir and diagnose where the leak is originating? Must you take off the front bumper or is there a less intrusive means of access, such as through the wheel well liner? This may or ...