I just got my Letus Extreme from Zacuto with their base/rail system. The problem I am having is the power switch works intermittently. Because the way the rail works, the power switch is right up against the rail. Sometimes I can switch it on and it works fine, then I can try it again and t fails to hold in place and keep it on unless I hold it in. Then sometimes it stays on for a few minutes and then goes off . . . any ideas?