Singer bobbin problem

I purchased a Singer 6160 Brilliance sewing machine, and it hasn’t even been a year, yet it constantly malfunctions. It won’t sew even two simple fabric layers without issues. Every time I try to use it, either the bobbin tension or the thread tension gets messed up. I already took it to service on...

I purchased the Singer 6660 sewing machine with high hopes, but I was let down almost immediately. Within just 10 minutes of first use, the bobbin case rotated out of place, causing the machine to malfunction. I sent it back to the store and requested a replacement. Instead of a new unit, it was rep...