I know of people that need to get their treadmill maintained or fixed over time. I am recently starting to use my treadmill again, and want to keep it in good shape long term. Do you have any tips or hints to keep it in good shape? I notice for example, that the part I am walking on, is migrating to the left a little bit, and if that continued on it would eventually run into the left side, etc. It would then need to be fixed likely.