I think the new nordictrack treadmill is wonderful! It's much better than the old Bowflex treadmill I have sitting out in my garage, which broke months ago; I gave up on trying to fix it, as it soon proved not worth all the hard work and effort. The nordictrack treadmill, however, hasn't broken once or even shown any signs of breaking in the month that I've had it, unlike the Bowflex. You should definitely buy this product!
It depends on where the NordicTrack treadmill was originally purchased. If it was purchased through a major department store like Sears then the treadmill may still be under a warranty service. These stores often have a repair service available. Otherwise, the only options would be to contact the NordicTrack company directly, or to possibly find a local handyman to attempt to fix it.
You can go online to find lots of information about how to fix a treadmill yourself. If you go to YouTube you can find instructional videos on how to fix common problems with a treadmill.
Your treadmill belt may be sticking due to lack of lubrication, debris buildup, or misalignment. To fix it, try lubricating the belt with treadmill lubricant, cleaning any debris from the belt and deck, and adjusting the belt tension and alignment as needed.
You should fix your treadmill if it does not cost more to fix than it does to buy a new one. If it costs more than half, than you should just get a new one and make sure it got warranty.
Give it away and purchase a treadmill from a company that has A) customer support and B) quality products
Your treadmill may be stopping due to issues with the motor, belt tension, or power supply. To fix it, you can try lubricating the belt, adjusting the tension, checking the power source, or contacting a professional for further assistance.
A few possible reasons for your treadmill slowing down could be an issue with the motor, belt tension, or the motor controller. It would be best to have a technician inspect your treadmill to diagnose and fix the problem.
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The question is broad, there are many things that can go wrong or cause problems with a treadmill. Usually it is either the belt or the motor that cause the most problems. Is your belt slipping, or "bogging down" while you are on the treadmill? Perhaps your unit is stopping after a few minutes of walking or running. To answer a specific question would require more input from the treadmill owner. I do provide treadmill troubleshooting tips on my website at http://treadmills.cc Thanks, Paul