So I have been having some issues with my MX-8. It has worked fine since I got it until recently. It keeps either getting stuck on the drain and will not move (stays upright), or ends up tipping over on its back at the stairs and tries like **** to climb the steps to no avail. I took it into a local pool store where they looked at it and told me the only thing potentially wrong would be the tracks, which I had them replace. Everything else was apparently fine, including the directional control devices. Normally, I would think since it's not the vacuum, it would be an issue with the suction, but the suction at the end of the line was at 3 on the suction tester, and the wheels rotate 10x in 25 seconds, which is par for normal operation. The suction towards the first segments of hose are a little bit higher higher (4 to 5 in a 7 segment hose), and when raise above the water, some of the connections sound like they are sucking in air. I wouldn't think this would matter if the proper suction is at the end of the line, but I could be wrong. Would it make sense to use PVC glue on the connectors or some other kind of epoxy to reduce the loss, or would I need to replace my hose altogether?
A couple things to note:
1) It is currently set to the larger debris setting and always has been.
2) I have a dedicated vacuum line
Any ideas?? Any advice is greatly appreciated.