Group Texts Failing

Hello AT&T,   I've been with AT&T for decades and this failing group test is a HUGE defect that is making me switch carriers.  Why hasn't AT&T resolved this group text issue after many years of complaints?? I am in the tech industry and when we hear of the same case issues repeatedly, we fix the issue.  In this day and age when text messages are becoming the primary way to communicate, why would you ignore this.  I too get a flood of text messages, missing several in the chain, all at once.  When sending, they don't go through.  The group can be 3 people or 8 people, same behavior.  Resetting phone doesn't change anything.  AT & T, when will you recognize this group text issue and fix this before you lose more loyal customers like me?  It's completely up to you ;)