Had my first flat of the year yesterday on a group ride. Very slow, rear tire. Didn't see anything sticking through the tire tread though there were a couple of disturbing small cuts. Installed spare tube and headed our way to a food stop, where, unfortunately, I realized my rear tire was getting soft again. Given that I only brought one spare tube and no patch kit, I was getting worried. Once I took a look, I realized that my annoying Lezyne mini pump had yet again unscrewed the valve core just a bit or enough for the tube to lose air. My efforts at tightening/repumping failed, so I borrowed a riding buddy's pump and all was good. That's the last time I rely on that Lezyne!