Unable to send text to multiple recipients

[g0dmagnu5]

So, this morning, i tried to send out a text message to more than one person asking for email addresses. After waiting over and hour and only getting one response, i sent an individual message to someone that didn't respond. Well, they said they never got anything. So i did some playing around with sending test texts, and it turns out that anyone listed after the first person is not receiving any messages. This worked before and for some odd reason just stopped working?

Any direction someone can point me in? i'm not using a custom messaging program.

Worse come to worse and i need to set the phone back to factory defaults, how do i do that?

Carrier: Sprint
Rom: 3.35.651.2