Got an order to embroider a bunch of Nike tote bags, nothing hard just the school logo with the kids name underneath, we've did them before so no problem right ::) well we do about 7 bags and run out of thread so I toss on another spool and boom crap hits the fan!!! the stitches are looping like crazy at the top. Well we reset tensions first the bobbin that didn't work then the top knobs that didn't work, I made sure everything was threaded right good there, just a big ole head scratcher, finally got the problem fixed...it was the thread I was using, I switched brands, so I ordered the same brand I was using problem solved. I didn't think different brands of thread would make that much of a difference but it did with these bags. I was using Madeira first and switched to Robison Anton, can't say what the heck was going on with RA, as this is our go to brand for just about everything around here and Madeira we use for certain college order's because of color, so if you have sew out problem on certain material's could be the thread your using.