Has anybody had a problem with the VT Bass (or any other Tech 21 pedals) when it comes to the switch sticking in the down position? Bought one used not that long ago, and I'm getting frustrated with the switch - sometimes when I press it down it just stays there till I lift it out. I'm not sure if Tech 21 will help me, considering I bought it used. I put a bit of oil on the switch, but it didn't seem to help. Any thoughts?