Maybe I am missing something here but the only messaging app I have is blue icon called messages and I have so many of these same Bluetooth issues that I was ready get rid of the phone the surface buds and anything else microsoft I own. It has caused me to almost crash multiple times. Is the blue app the one you guys have been talking about fixing your issue? I looked in the Google store for message+ I find nothing no such app. I too have a case open with Microsoft and much frustration with this problem which I have posted many times any help would appreciated
If you search the Google Play store for Verizon Messages you'll see the red icon app. Once installed, it's called Messages+ on your device. A previous post by someone else stated uninstalling Messages+ fixed their Bluetooth issues. I uninstalled it on my Duo2 and now my Bluetooth no long disconnects. Microsoft engineering is looking into this issue.
Secondly in this thread, we started complaining about MMS messages with images come in blurry if you're using Google Message or Signals. If you're using the Verizon Messages (Messages+) app, the image is sharp and clear. uhg... so, between a rock and a hard place here.