This is my second year using this robot. Last summer it ran 24-7 this summer is about 8 hours a day. It has always worked perfectly until just recently. I noticed that the 2 swivel wheels don't always go strait, they sometimes get stuck sideways and drag across the pool bottom making the cleaner go in circles or stop completely. Took a look at them and they have a lot of wobble. I was wondering if anyone with a fairly new vac could take a look at their wheels and see it they wobble too or are fairly solid and just spin in circles nicely.