Problem using monitor postpartum

I have been having difficulty with the monitor (not in cycles yet-using the postpartum transition protocol at nfp.marquette.edu). For the first 3 20-day cycles, all has worked just fine. After recently finishing another, I went to reset for a new cycle. I went to Day 5 so that I could start getting Day 6 readings. The issue this time is that on Day 6, it shows a low reading (w/o me putting in a stick) and doesn’t ask for me to insert a stick to read. The next few days it did the same thing.

I attempted to do a total reset where you see all of the symbols. I held the button down for much longer than 20 seconds. Nothing happened. I then attempted to just reset the day to 5 as before. Again, it reads “low” and doesn’t ask me to insert a test stick.

What is odd is that hitting m to get to low number again doesn't work. And neither does trying to reset the device altogether.