Maybe you have lint that needs to be cleaned out under the bobbin area. That could make it have problems too.
I had a Singer my mom and dad bought for me years ago. Just sewed and did nothing fancy...one of those $80 ones from Walmart. It was a great machine and I gave it to a lady who wanted a machine to teach her daughter to sew, but didn't have the extra money for a new machine. Since I was buying a new one, I just gave her mine.