This seems to happen randomly to me, I haven't yet noticed a trend... but it happens multiple times daily.
Sometimes when I attempt to send a text, I will get a error message saying that my text was not able to be sent. I then have to click on retry in order to get it to get sent. The problem with this is that, when I click on retry to resend it, all my other incoming texts from other people just start pouring in. Apparently, all those texts got held up for some reason until the point where I attempt to send a text, fail, and then resend it manually. During this downtime period, I don't receive any phone calls either. When people call me, my phone doesn't ring and they get sent straight to voicemail.
Does anyone else experience this problem?