This is really one for an engineer. It involves loosening the bobbin race and moving it slightly till the hook catches the thread,and then retightening. Can be an awkward job requiring 3 hands,even for an expert!
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Be sure to use a brand new needle. A bent/damaged needle may not connect with the bobbin thread.
If it still does not pick up the bobbin thread, your machine most likely has a timing issue (the needle arrives at the wrong time to intercept the bobbin thread). There are multiple web sites and videos that discuss sewing machine timing. Or take it for service.
try a new needle
make sure the bobbin is not warped
make sure the bobbin case area is free of lint or loose thread
make sure you hold the upper thread tail while it's going down to pick up the bobbin thread
make sure there is a 2 to 4 in tail for the upper thread to grab
It sounds to me that you might have the wrong type of bobbin in the case. The top of the bobbin should not be higher than the case. Thread will slip through the space and cause problems. Also unevenly wound bobbins will also cause this symptom.
Or your losing tension which you will have to adjust tighter.
In order to see whether or not my euro-pro 9110 had a timing issue, the service rep had me change out the needle (making sure I was using anything but a Singer brand needle--they do not work in these machines). I re-threaded the needle, took out the bobbin casing and the plastic ring encasing the bobbin, then lowered the needle to see if the hook on the metal ring holding the bobbin actually catches the thread on its own. If it doesn't catch, it's a timing issue and needs repair. They can walk you through this process of troubleshooting and set up repair if need. Call Eruo-Pro's customer service center for sewing machine service and repair at 800-798-7395