I know I hear nothing but good things about this pool cleaner, but it's driving me nuts. I find that it spends most of it's time trapped in one corner of the pool. The back up valve functions yet does not always pull it out of this corner. The RPM's are correct and I have adjusted the jets on the back in about every conceivable direction, but no luck. My pool is an IG vinyl liner that has some sharp internal line angles which I think is not helping...no smooth round corners and edges to deflect it . I'm beginning to worry that it may damage the liner as it stays in one place so long. Any ideas..or is the shape of my pool the problem? Thanks.