Hi @eliz-123 sorry you are experiencing problems with your MM3.
Unfortunately, I cannot offer any words of wisdom.
Instead, the reason for my message is to ask why you are using a MM?
I used to use a MM2 before Libre provided real time updates. But was grateful to get rid of it and the charging issues as soon as the LIbre was updated.
Am I missing something?
Can't answer for @eliz-123, for me I use the MM3 when the Libre bluetooth doesn't work well (some have unreliable signals or develop unreliable signals as they get past 7 days use), could also be to drive a smartwatch app, increase bluetooth range, improve bluetooth connectivity to some phones etc.
For me its to make the BT connections more reliable (especially needed when looping) - not always needed (current sensor is working perfectly without, last weeks one was terrible - so used my MM3)
I have the same problem, the transmitter flashes red all the time, and when I try to scan the sensor, I get an error that the sensor is not detected. Have you found any solution to this problem?