Having had a similar problem, have you made sure you put the presser foot down? I tried everything that has been suggested and then someone mentioned this to me. Voila - that was my problem all along.

check the bobbin area and make sure there isn't a tiny piece of thread caught in there somewhere, and make sure the needle is seated correctly.

I check all above even changed the bobbin. Still having the issue. I noticed when I was testing it it felt like it was catching on something. I think it's getting caught on the cover plate. Will have to have hubby see if he smooth it out. It is nicked a little. I only have a month to get a total for 3 quilts quilted. Two are ready one I still have to be put together. Nothing like waiting til the last minute

Quilting help
 

Make sure the presser foot is down.

Clean, rethread and watch your speed.

Put the quilt in the closet. Make a pot of coffee. Take a nap. Take a bath. read a Quilting magazine. Then go to the sewing machine. Completely rethread it . Stitch on a scrap to check tension. Now get to the FMQ.. Good luck and hugs and patience.

I notice you are using black thread. Try stitching something with another color thread. The only time I ever had trouble with my machine" acting out" was when I had a bad spool of black thread and didn't realize it. I did everything I could and finally took it to the dealer for clean, oil & adjust. They did all that,sewed out their test and it was just as bad as mine so they redid everything and had another tech stitch-same thing so they set it aside until the next day. For some reason the next day they just automatically took everything off, including the thead I had left on, redid all the work and put the red thread they usually used so the stitches showed up nicely. Perfect!!! They couldn't believe it so tried the black thread again & it went back to the bad stitches. They concluded the spool was probably old, even though I had purchased it from them. They tried another spool from the store and all was well. Lesson learned now I buy only small spools of black.

If all else fails, go to your owners manual to see which adjustment you need to make. DO NOT throw your sewing machine across the room or out the window, there is a way to get it adjusted right, just keep at it. and try to have fun

It may be that the bobbin is not wound as your machine likes it. I had this happen and once I changed the bobbin it was not happening anymore. I think that I used some "out-dated" thread on the bobbin. Who knew that thread had a "use-by" date? Good luck.