I have an auto cover on my spa that needs to be replaced. When the cover was installed about 7 years ago, it had a wrinkle running down the middle. I was told by the installer that the cover material would stretch out. Unfortunately, it never did. Subsequently, the material started to separate along the wrinkle, thus, causing the spa water to leak out. Over time (and numerous patches) the leaks became worse & no longer repairable. So, now it's time to replace the cover. I mentioned this situation to a pool guy that I trust. According to him, it is "hit-and-miss" whether a new cover can be installed without a wrinkle. My question: is this something that I have to accept or is it just inaccurate cutting of the cover material and/or poor installation? Thank you so much.