Stitch pattern not proper

Question

I have a Kenmore sewing machine. Model # 385.12318.

The stitch is not coming out well. And it seems like the problem is with bobbin thread. Needle thread pattern is good. The bobbin thread pattern comes ok for 3-4 stitches and then the next 2 are very loose or looped.

I tried all the trouble shooting solutions from the manual but no luck.