Question about raising/lowering saddle
I'm on a new Trek 3900 and I'm quite new to cycling. The bike is about 10 days old, 73 miles. I've tried adjusting the saddle position up and down, but when I complete a 5-10 mile ride, the saddle is all the way down again. The quick release piece is VERY tight, almost impossible to loosen by hand, although I do. And it is VERY hard to tighten by hand once I find the position I want, but somehow I get it closed again. Then I ride, and when I'm finished i notice the seat is once again all the way down.
Suggestions?
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2015 Sirrus Elite
Proud member of the original Club Tombay