I've been experiencing poor FM reception on my new 2010 Prius V. It sometimes seems to improve when I'm stopped, and occasionally it will be good for part of a day, but 85% of the time the signal has a lot of static. My 2008 Prius IV doesn't have this problem. I've checked to make sure the whip antenna is screwed in firmly, which it is. Anybody else having this problem? Any solutions?