Is anyone else having trouble with their Vado SL seat tipping backwards: i.e. the front creeps up/back creeps down? On my new Vado SL 5.0 EQ, I've had to have the seat adjusted twice already, since it slips slowly (very slowly) to a slightly front-up back-down position. First time LBS suggested tightening it a bit beyond the recommended torque. 2nd time they repositioned it correctly and tightened it significantly beyond the recommended torque. And it's still rotated back a bit, after a couple of days of riding. I wonder if this is a unique problem I'm having, or if there is some design issue. Or perhaps it's a faulty part that needs replacing?