Does any on own a Brother CS 80 sewing machine? I own 2 and both give me the same problem. My top thread bunches up on the back of my sewing. I thought it was only the first machine I bought but the second one does it too. I contacted the company and received 2 different answers, neither of them worked. I love the machime and really want to make use of it.Also took it to a repair shop and they said they knew nothing about repairing this machine.