I have an Android (Droid Turbo - Android version 6.0.1 Marshmallow). I am using message + and in a group MMS that I have been in for years. It is a mix of iPhone and Android users. For some reason for the past few weeks if ever I need to turn my phone off, it completely deletes that entire group history chat. I turn the phone off and turn it back on and the group chat is completely gone from message+. It starts fresh when someone sends (or I send) a text to the group of people again, but it will delete if I turn off the phone. I've lost pictures and other information that I needed that was in the text history.
I am in several other group MMS all with mix of android and iphone and none of the other groups delete, only this one particular group.
Any insight on why this would happen?