I upgraded to Marshmallow back at the end of May and it seemed to help all the battery draining that was going on. I recently got another update on 7.1 and never could tell exactly what that was for, but nothing since then. About 2 weeks ago, my phone stopped notifying me of group texts, which is a pain, because we consult with each other that way a lot at work. When I look at my screen I see all these texts have come through and then it will randomly take me to one of the users older texts and make me click on download in order to get them. I have missed quite a few important conversations that way. Does anyone know what might have changed? The people I group text with are a mix of Iphone and Android users. Any ideas welcome...