My machine will not advance on it's own what do I need to do to fix it??

Time to take it for service. There is a fault that will not allow your machine to advance to the next step. It stops for safety reasons.

if you have the manual to the machine then you can see where
the feed dog lever is & check to see if it's in the up position
also you can take the machine in to be checked to see if the feed dogs
need repairing or replacing

if the sewing machine repair shop knew the machine needed a clutch
adjustment, then why didn't they fix it. or if they said they did & it's not
fixed, I'd call them & ask them why the machine is still doing the same
as it did?

you need to find a different sewing machine repair shop

have you tried a new needle
have you tried changing thread--top & bobbin
clean under the needle plate & in the bobbin area for loose threads & lint
make sure every thread guide is used
make sure thread is not hanging up some where on the machine

when you have to take the machine in 3 time & it's no better, then their not fixing the machine, I highly recommend a different sewing shop to check out the machine if my suggestions don't help. no since in throwing money away, when their not going to fix the machine like their suppose to.

if it's hitting something solid, something is possibly broken or loose & also could be out of time
it needs to be checked at a sewing machine repair shop

here's something to check
is the needle inserted all the way in to the needle holder?
needle--flat side goes to the back of the machine
is the needle clamp screw tight or loose?
if the needle is correctly in the needle holder & the needle clamp screw is tight --then the needle bar is out of time & need to be serviced
IF YOU DO HAVE TO TAKE IT TO BE SERVICED AFTER YOU GET IT HOME STOP RIGHT THEN & SEW ON THE MACHINE TO MAKE SURE THEY FIXED THE MACHINE & IT SEWS LIKE IT SUPPOSE TO, I HAD ONE CUSTOMER THAT TOOK THEIR MACHINE TO A SHOP & THEY CLEANED IT AGAIN & DIDN'T FIX IT BUT CHARGED THEM FOR IT & THEY BROUGHT IT TO ME TO FIX & IT HAD TO BE RETIME
did you get a instruction manual for the machine if not check at singer
Go to the singer website
Click on customer support--there will be a drop down menu
Choose instruction manual
In the box type the model number---2009
Click search--if you don't see a manual--contact singer customer service

first let's deal with the needle becoming unthreaded, Keeping the needle threaded is easy, always keep thread tails of 3 to 6 inches on the top thread & bobbin at all times, & make sure the thread tail are pulled behind the needle before you start to sew,, this will ensure that the thread will not come out of the needle when you start to sew.

you mention the fabric is thin,, do you have a needle that's right for the fabric your sewing?
thin fabric needs a different needle than blue jeans fabric, check your top tension & see what the setting is on, usually 3 to 5 is good.

when the needle & thread are right for the fabric then the sewing is good.

also clean under the needle plate & bobbin area for loose threads or lint

also it's a possibility that the machine could be out of time & would need to be serviced by a sewing machine repair shop-as they have the tools for the job

if you have a manual check where your feed dog knob is, push the knob in the opposite direction,,if that doesn't help then something may be wrong with the feed dogs,,you should be able to see the feed dogs in the needle plate area & to feel them with your fingers.
you may need to have the machine serviced at a sewing shop

if the sewing machine is not sewing & staying in one spot the that means the feed dogs are not working properly.
I also have a necchi sewing machine, check the needle plate area that's where the feed dogs are, if the feed dogs are up where you can see them & even feel them with you fingers when you rub your fingers over the needle plate area, if you can't see them good or feel them, then they are not up,,my instruction book shows that you have to remove the extension table, their should be a small door in front of the needle plate area to open that's where the feed dogs are if they are not in the up position, where you can sew, if they are in the down position move the lever to the opposite direction & see if that help the machine to sew, if it make makes no difference which position there in , then it's possible something is wrong with the feed dogs & the machine needs to be serviced

Hi, I've got a necchi sewing machine too, not the same model as yours.
you said you were sewing denim & the machine jamed & bent the needle, it's sounds like the machine is out of time, sometime it doesn't take much to get them out of time & would have to be serviced by a repair shop with the tools needed to fix the timing.