Serpentine Belt Issues

Hey everyone. For the past month my serpentine belt as been giving me issues. It'll be fine for about a week or two but after that when I check under the hood, it's been cracking down the middle or wearing. The belt normally splits down the middle and i'm running on half a belt until it snaps. I have a Kenne Bell 1.7L and I've checked the aftermarket idler pulleys (and the rest of them) and I can't find anything wrong with any of the pulleys. Does anyone have any ideas because I'm running low on ideas...and patience.

It's a 2001 and this has recently started happening after the cold spell we had in NY. I've thrown on 3 new belts within a month and a half. The alignment looks fine, i've checked it from top to bottom. I've shimmed the aftermarket idlers that came with it the best I could after the rubber melted and fused with them. The wear seems to always start on the flat side of the belt.