My bottom stitch is "loose"
You might try adjusting your bobbin. You can do this with a tiny flat head screwdriver. Adjust in very small increments! There is a screw located on your bobbin case.
Here is the info directly from the manual:
"To test if the bobbin thread tension is correct, suspend the bobbin case by the thread and **** it once. Correct bobbin tension will result in the thread unwinding by only one or two inches. If too loose it will unwind continuously. If too tight, the thread will not unwind at all. When adjusting the tension on the bobbin case, make only slight adjustments with a screwdriver."
That is usually the cause of garbled up threads on the bottom side. Sure hope this helps!
(The 132Q is my third Singer, but will be my last. It's been a nightmare to deal with, and ALWAYS has something going wrong with it. I can never just sit down and do a project.... it is like the settings never stay put. There is also a LOT of plastic inside this model, and it cracks, breaks, warps, etc. We've replaced plastic gears/parts with metal parts, and it still acts up. Just a lemon model!)