I purchased one of the self monitor machine and found that I too stopped breathing several times a night.
Then I started using the sticky nose strips which helped remarkably according to the monitor.
Then I started taping my mouth shut which was a little difficult because of the mustachio and beard but I figured it out. This also helped.
Finally, I wired a small switch to a small pager motor with a rechargeable lithium battery that I placed into a small wooden disk that I pin to the back of my sleep shirt, about where my shoulder blades are located. Then when I roll onto my back, the pager wakes me up and I roll on my side.
I still have some stoppage at night, but that has made it much better.