Hi, I am Martyn, welcome to JustAnswer, I am sorry you are having these issues today, it can be frustrating. I am happy to try and help work with you to try to get this resolved if I can.
Try a sharp new needle first (and check it is in correctly, flat side to the rear for modern machines, or as per Manual )... this is often enough to resolve skipped stitches
Did you have a recent Jam ??
Check for rough patches and burrs everywhere the thread passes... use a fine emery board to polish
Tease out a QTip/Cotton bud etc to be a little fluffy, then trace all over the metal and plastic regions and the bobbin case… it will likely catch and show you where the burr is
NOTE : If it is under warranty, do NOT attempt to do too much, lest you void the warranty
If you have had a recent jam, then this suggests timing may be affected
In any event..... here's how to check
Unplug machine and remove all thread
Remove Needleplate, Free Arm and Bobbin Case so you can watch the needle easily
In correct Timing, the needle will be at the lowest point just before the tip of the hook passes behind (to catch the top thread)
If the hook passes too soon or too late, it will need re-timing...
This short VIDEO shows how a stitch is formed… if the hook is not in the correct position, it will not catch the needle thread
Here is a basics guide to know when and how, and whether it is time to hand it off to a trained Tech
If the needle to hook is out of balance it will never form a stitch
As needle rises, the hook MUST be above the eye approx 1.8mm
Turn slowly by hand and watch the relationship
Is there any deviation to this balance of needle to hook ??
Service Manual is available.. HERE if you feel the need to DIY this