Just recently my V1 suction cups have been failing. I was using the small ones, but one side kept falling (different sides too). So today I go out with the big suction cups, clean the windshied thoroughly with Windex and spend a good 45 minutes getting it mounted perfectly. I hit the canyons for some fun, no problems. On the way back I stopped at Target, and when I come back out the V1 is hanging by one suction cup again.
Kind of shi**y because I take a long time to get it mounted right, and then I never get it stuck back in the perfect spot again when it falls. So then I had the bright idea to replace the V1 suction cups with my Escort ones, but surprise, the V1 cups are proprietary or something with the little hook thing.
I never once had an Escort suction cup fail like that, and don't recall having this problem the last time I had a V1. It only happens in my S2000 too ... the other cars it stays perfectly.
The bright side is it's never fallen completely ... one cup has always held it so far, but I can't figure out whats going on.