Do you ever feel like you're in a toxic relationship with your bobbin? Oh yes, we've all been there! This is such a frustrating problem to have when you're sewing along and all of a sudden you flip your project over and you see this!
You can see the two differences between a healthy stitch (top) and when your bobbin thread starts having issues (bottom). Not to worry because I have found some really great tips on how to remedy this problem. I break these steps down further below. 
1. Check your thread tension. I noticed when I lowered my thread tension my bobbin started to act all funky and ended up tangling my thread resulting in the photo above.
2. Change your sewing needle often. When is the last time you've changed your needle? One of the many things to remember is to change your needle after each sewing project or 8 hours of use.
3. Rethread your bobbin! Over time, your bobbin can move around and rethreading will help! Usually when I am going though this process I will also re-thread my needle as well. This is a good time to double check that you're inserting your bobbin in the correct direction. Look to your sewing machines manual for further instruction on this as they are all configured differently.
4. Check the overall shape and health of your bobbin. Is the psychical bobbin bent in anyway shape or form? If so - replace it ASAP! Also take a look at your thread to make sure it's tightly wound on the bobbin itself. If your threads loosen up or maybe weren't tight to start with this can definitely be causing some issues. Re-wind the thread on the bobbin to make sure it's tight and secure. You also want to make sure you're using the bobbins that came with your sewing machine. Sometimes using aftermarket bobbins can complicate things more than it's worth so stick to using the ones provided.
5. Clean your sewing machine! Your sewing machine is a magnet for dust and little tiny pieces of fabric and thread. Dust out your bobbin case with a small soft brush. Usually your sewing machine will come with a small brush for this. If not, you can use a small paint brush to achieve the same cleaning effect. Using canned air here is a no-no! Canned air will push those tiny fibers further into the creases of your machine causing larger issues.
6. When is the last time your machine has been oiled? Anytime you are replacing a bobbin, you should be oiling. However, this does vary by each sewing machine. Check your manual for instructions on how to oil and the frequency. Some sewing machines may not need oiled at all so it's super important to keep your instruction manual handy as you're learning your sewing machine in the beginning.
7. Last but not least, are you putting the needle in the down position along with the foot before you start sewing? Sometimes this issue can be caused by the machine not being able to grip the fabric properly at the start of your stitch.
Hopefully these tips can help point you in the right direction when you're running into this problem. It's okay to walk away and come back if you're feeling very frustrated. I know we've all been there before, ready to throw our beloved sewing machines out the window. Take a breather and grab some small fabric scraps to test out if you have solved your issue. There's nothing more frustrating than sewing your project and realizing that you're still having the same problem. Save yourself the time and use of a seam ripper and sew some scraps first! Let me know what you think in the comments below! If you have any other recommendations for helpful tips please leave them in the comments as well!
Thanks for reading & happy sewing! 