I have a 1000 x 1000 C-beam I made about 2 years ago. Be using it every week since this time, with only minor issues. About a month ago I have a issue with the left Y axis which makes a noise and vibration. I have check all the connections and nuts which seem to be fine. But then can cause the left and right Y sides to get out of sync which are not square to each other and the X. I thinking there a issue with the wheels and/or the gantry connections being to tight/loose. Any ideas to check?