Do you have a warranty? We bought ours at Sears and had free maintaince on it for two years.Perhaps you could try contacting the company that manufactor and see if it is known for this problem? I'm not very mechanical,so sorry I dont have better advice.

In 2005, I bought a high-end Nordic Track. It worked great until a few months ago, then it would just shut off after a minute or two. Fortunately, I had a maintenance contract on it. They sent a serviceman out--he said the motor went out. He came back to put in a new motor. It still didn't work, so he had to come back two weeks later and replace the motherboard, or whatever it was called. It still shut off. He called the factory. The verdict: the treadmill is on the lower level, where we have ground-fault circuit interrupter (GFCI) outlets. Apparently, you aren't supposed to use treadmills on GFCI outlets. We were flabbergasted. The treadmill worked great for 3+ years. The serviceman said that GFCI outlets should be replaced every few years (ours are 12 years old)! We now plug it into a regular outlet, and it's working fine. You might want to be sure that your treadmill is happy with the outlet it's plugged into....

A book with beautiful photographs that might help you to get off the "decorating treadmill" is No Compromise Decorating by Lynette Jennings (2004). It is an insightful look into the decorating mistake many of us make: compromising what we really want for a trend or a quick fix. Here is an excerpt: "Always celebrate the connection of your home to your life; don't apologize for it, and don't compromise. Home isn't a look, it's a feeling. A place where memories are made and legacies are formed. That said, why would we for one second hesitate to make choices based on anything but what our heart desires? Why would we even for an inkling be distracted by a new product display, a neighbor's comment, or a 'dream home' featured on TV or in a magazine other than for the inspiration it provides? Call it conviction, stubbornness, determination. To eliminate the pressure. The fear of decision. To dig for the courage to live how and with what makes us happy. That's decorating without compromise." Life is too short to compromise. Surround yourself with colors and objects that bring YOU joy.

A surge protector may not/is likely not going to work, many simply try to clamp/limit any voltage spikes that might appear on the power line. That doesn't stop noise from passing in both directions. Your treadmill is likely using an internal variable frequency or duty cycle power supply to control the motor speed and it is the switching noise from this process that is likely getting back onto the power line and triggering the smoke detectors. Simple surge protectors won't be able to stop this kind of electrical noise from passing through. I think you need a true EMI filter such as this between your treadmill and the incoming power: https://www.galco.com/buy/Qualtek-Electronics/854-03/003?source=googleshopping&utm_source=adwords&utm_campaign=&gclid=Cj0KCQiAlZH_BRCgARIsAAZHSBkx1NY1NwCUy1KJ2qF5oUzpNn-jS_qaiPTiwDtGuTlA8t0t8JYkHZEaAtR4EALw_wcB There are many sources for such a filter. It just needs to be sized to the max current draw of what is being protected, and then encased so the connections aren't exposed.