Timing
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Have you tried to change the needle? if the needle is not perfect, the bobbin won't catch the upper thread correctly. There is only about 0.1 mm of space to do that, so even a needle that looks perfect coud be very slightly bent and give problems while stitching. First of all , in your place I would try to substitute the needle.
Then, are you using one of the original plastic bobbins? I once bought sone cheap "universal" bobbins that were only vey slightly smaller than brother ones (VERY very slightly smaller),..Well, the machine went crazy and I had a lot of problems with sipped stitches until I read on the internet NOT to use "universal" bobbins, as bobbins look the same but are not made exactly the same way and they must be EXACTLY those made for your machine...I bought some bobbins that were made especially for this sewing machine, and it never skipped a stitch again! (It's possible that other sewing machines work wel with universal bobbins, but not this one, at least not with the universal bobbins I had bought!)
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