It can be so frustrating I know :( But Jetnica gave good advice. Get the manual out, change the needle, make sure bobbin is wound good (tight), re-thread. Lots of times those things "fix" whatever was causing the problem. My machine sometimes will keep telling me to check my top thread. I have found out it is nothing to do with top thread but if I just take my bobbin out and drop it back in it will finish sewing just fine. Some machines are more tempermental than others, true, but you can have problems with any type machine. So if you learn to fix the one you have you will be "king".