You may need to tighten your upper thread tension or loosen the tension on your bobbin. I don't know if you are using a newer model sewing machine or an older one; but if it is like mine, there is a little screw on the bobbin you turn to loosen the tension.
My Kenmore sewing machine bunches up on the bottom if I am using a different type of thread in the bobbin than I am using on the top part of the sewing machine.
SOURCE: the tension is off ?? bottom thread bunches
Sounds like it could be! Probably worth trying to readjust it. Are you using a fine fabric too? That can cause bunching.
SOURCE: Thread keeps bunching on the bottom of thick material
try a different needle
here's a link to a free manual from singer
http://www.singerco.com/uploads/download/1199_8770-efs.pdf
some machine can't handle thick fabric & some can
rethread the machine top & bobbin
clean under the needle plate & in the bobbin area
make sure the thread has not come off the thread take up lever
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