This is one of the problems that the VX has. I had the same problem and kept returning to the dealership complaining about the leak. The first 2 times they replaced the windshield but it didn't help. The 3rd time they ordered a windshield directly from Japan and added lots of sealant. That fixed the problem and I have been leak free for over a year and a half.

If you're still under warranty have your dealer order a windsheild from Japan (takes about 1 week) and seal it tight. Shouldn't cost you a cent.

Good Luck