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.