+1. I'm assuming the OP is talking about the 'wavy tip' (Brad, if not, let us know) type of warping. This happens with some reeds but it's not a problem at all if you just get the reed wet and hold it against a flat surface for a few seconds; the mpc table works well for this. And it does help to keep them stored in a reed holder. I just played the past four gigs on a reed whose tip warped every time it dried out. After a brief soak the reed played great (not good, but great) and it's still going strong, even though I rarely get more that four gigs out of any reed.If the tip is getting a little wavy just soak it in some water or in your mouth for a couple of minutes, lay it on a flat surface or the table of your mouthpiece, and 'iron' out the wrinkles with your thumb by pressing from the heart to the tip a few times.
Slap it on and away you go.