I'm sorry that I traded in my 7570 for a 2144. It has never really worked well as it won't talk to the computer. A friend still has her 7570 and so far, we've only had to change the internal batteries twice. other than that it is still fine.
She has another (1475 I think from memory) which still runs OK but she can't buy any feet and parts for it very easily as the sizes changed when they manufactured later models.
I am thoroughly content with a mechanical Brother straight stitcher now - it has none of those issues.