Originally Posted by
bagel007
It cannot be the case. I clean the chain after each ride. I would've noticed that the the tire is deflated, even partially.
You missed my point. Tires don't instantaneously get flat, and you don't immediately stop. You're still riding as the tire gets soft, or in the event of a blowout it takes some time to stop.
However, if the wheel is out of true by less than 1/16th or so, I'll bet it's been that way, and became an issue because of repositioning.
Either put the wheel home by closing the QR on the ground as others and I suggested, and if necessary re-center the brakes for that position, or manually center the wheel to best clear the brakes and close the QR there. The second approach is less desirable because it means re-centering the wheel every time you open the QR.