I know this is an old post, but here are my thoughts anyway.
I got the MM CGM 2.5 years ago. I used it for about 10 months, then got sick of itALWAYS beeping at me, and usually being wrong. I went back to it after about a year, and it has been going better. I was getting very “burned out” by the CGM, and needed a break.
The number is not always accurate, but the trend seems to be, so I know if I am falling fast or going high (although I may not know how high). Here are some things I have found:
I always insert a new sensor at night, and hit "start"first thing when I wake up. It usually asks me for a calibration within 10 minutes, and that accurate calibration gets things off on the right start. Inaccurate calibrations really throw things off.
I get interference from some electronic devices, such as baby monitors, so it is good to be aware of that.
The sensors don;t seem to work at or near their expiration date…they get more and more inaccurate. Also, if the monitor is not fully charged you can have problems.
My sensors really stop working around 5-6 days. I have sometimes been able to get them to last longer but they get less accurate.
When I get a bad sensor reading, i put a new one in and start all over. In my experience, and once I get a bad sensor reading, it is very likely I will continue to get them,
All I can say is that I took a break, and looonng break, and it has been going better since I went back to it. I started using it again b/c I went to a new endo and they couldn’t download my pump, and he wouldn’t look at a paper record, so I wanted some readings to help us get more info.
Good luck! It has been worth all the effort and frustration for me!