Since the update in Dec. I have had failed messages. There will be periods of 20 min where I'm not able to send any texts via message +. Then it turned to where I wouldn't receive texts for hours. All of a sudden I would receive them all at once, time stamped correctly but hours late. The Feb update has not helped.
It's never okay to be dealing with failed and late messages. I am sorry to read that you have had an issue ongoing since December. I'd like to help you get to the bottom of this as I know how much we rely on text to communicate. What is the make and model of your phone? Where are you located (intersection, zip code)? What is the current software version of your device?