Hi, ive been using plus for a long time but since ive installed 3 ive been having the problem that after a while all my msgs will instantly come back, they wont even say theyve been sent and then come back. it just instantly displays as.. the following message could not be delivered...... has anyone else had this problem?

Thanks to anyone who can help

me i have every timeit happens i make me mad cause i think the contact went offline but the didn't. Ill get a screen shot next time it happens