My son has been on the MM sensor for the last 8 months. The first 4 months, it worked great! We were thrilled! The last 4 months have been filled with error messages all over the place to the point that we're hardly getting any use out of it because it is so off all of the time. I've called Minimed over and over and have not gotten much help. I have heard from my son's endo that others are experiencing frustrations over this. I'm wondering if it is the sensors themselves. Or maybe the transmitter? Is anyone else experiencing the same problem? Have you found any solutions? Any advice?