If you haven't been using too hard, the seller might be willing to take a look at it. For a while they bragged something awful of SMD Janome models. I found a some what similar model on
youtube, it's noisy and it looks like that's the way it is. I think there is a minimum of 2-5 years guarantee on sewing machines, and I think SMD offers 5 on your model.
I don't expect too much of machines like this but I know they can be good to have as a side machine or just the small jobs that turn up now and then. I looked it up on SMD, and it has a few nice stretchy stitches, and a freearm. I went for a vintage flatbed Singer 201, it's a very nice and capable machine. A vintage machine can paye off endlessly when you don't wan't to spend that much money on a machine. Mine is a joy to work on. All machines need a bit of care and attetion now and then, probably yours too. An older machine might have a few thing that need to be sorted out, often a lot of cleaning and oiling. The pluss side is they are meant to be taken care of by the owner.
The main thing I worry about when it comes to some machines like your SMD is how long will they last (broken parts etc.) and capability when it comes to flat felled seams on fabrics like denim, corduroy or densely woven duck. Some machines have the needle stop in two layers of plain cotton and the only thing extra is a lining on the back side.
I dont know about your SMD model, but some new machine can be cleaned by the owner; if so, take off the needle plate, take out the bobbin case and clean the area round hook, race and feed dogs where lent and pieces of thread tend to build up.