My Nolting dealer set mine up, gave me instructions on how to clean, care for, warm up, etc. When I moved to a new house, he came out, took it all apart, packed it and moved it and set it up for me again. Before he left, he made sure it was ready to go. There was a charge for the move, but worth it to make sure it was set up right and level, etc. If you have troubles, there might be a dealer in your area that could do the same.
Also, make sure all the tracks and wheels are clean...I do this every time I start a project and several times during the process. Even a tiny piece of thread can "bump" your machine. I keep small scraps of cotton batting, cut into approx 4 inch squares. I spritz these with regular rubbing alcohol and wipe all the tracks and wheels. I dust the whole machine with microfiber cloth. (I got a big pack of them at Walgreens) I just keep them close to my machine and clean it often.