I had this problem.... I finally realized my seatpost clamp had a crack in it. I used my tail light clamp as a brace of sorts to try to get me the last 50 miles, but it finally broke all the way through and I had to low-rider it to a bike shop for a temp clamp. Fortunately, I was a few miles from a shop- 'cause I probably looked like an idiot
But I obviously rode around with it cracked for some time- I hadn't had any problems, then one day I noticed it had slipped and from that point on I never could get it tight.
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