Small Appliance Repair Questions? Ask a Technician ASAP
If the Machine is only 6 mths old, it will be best to return to the dealer for a warranty assessment and repair.If you try to open and fiddle around, then it WILL VOID the warranty, so just do not do it !
It would seem likely the timing has gone out while sewing the heavy fabric... the machine is not industrial and will have limitations. When trying to sew, the needle will move a little before the Hook, and if it continues to force it's way, the two will fall out of balance and the Hook simply misses the Needle and will never create a stitch
Timing is not difficult when we know what to do, however it takes knowledge and training to be certan... not a home fix for the uninitiated
You can see how the timing looks by removing the bobbin case and watch the needle as it descends to meet the hook... the needle eye needs to be below the tip of the hook as it passes in order to create a stitch
Let me know what you see