For the last several weeks, whenever I try to "reply to" or start a fresh group text, it comes back with the red x. Even if it's to just 2 people. Needless to say very frustrating, especially since that it's the primary way we communicate in my business, so these texts are usually extremely important and timely. Does not matter if I'm on wi-if or not. Also happens anywhere. If I turn around and send it individually, they'll usually go thru, but getting more often that even single ones will not. Always check signal, and always strong. And sometimes takes up to 5 mins to come back with the "x". What do I need to do?
Texts are not gauranteed to be delivered despite the carrier's best effort. They are problematic for some even under the best of conditions. If you are sending texts greater than 160 characters in lenght, then they are even more prone to problems.
Oh, and clear out old texts. Free up some space. And as a final suggestion go to Settings > Apps > All > Messaging or Text (may be different on a Razr, its Messaging on my GS3) and clear data and cache. You may want to back up old texts first.
You can always try a 3rd party Text/Messaging app to see if it performs better than the stock app that came with the phone/OS.