No doubt, your laundry list of every single M&P related issue that you have ever heard about, read about or possibly even experienced first hand is considerably longer. But until we get more details from those in a position to share such information, there is no way to say if any of the items you posted here are even relevant as it relates specifically to the Texas DPS news. I think it's also fair to note that your list doesn't reflect the fact that many of the older issues mentioned have already been addressed by one of the many S&W rolling engineering changes or QC fixes, as they continue to address known problems and respond to their end users.
I did likewise hear the same rumors as L Pete: "FTF, FTE, and magazine lip problems", but have yet to see those rumors confirmed as actual mechanical problems vs. training issues related to the DPS recruits using these test pistols (see below). I have begun to wonder if the issue might be related to the bad followers (search this forum for details) that an OEM supplier recently provided for new production M&P 9mm mags, while they were struggling to catch up on backordered mags that were a result of panicked buyers looking to stockpile highcap mags. I received two of these bad follower mags from Midway during roughly the same time period as the testing. S&W is addressing the problem. Would have been fun to see how well an M&P chambered in .357Sig and using the same DPS issued ammo would have worked compared to their current Sigs.
There was a very recent article from Nick Leghorn at The Truth About Guns wherein he quoted the highest ranked Texas DPS source:
"As you are aware I approved the adoption of the Smith and Wesson M&P 9mm as the Department's service handgun beginning with Recruit School A14. However, we have been experiencing malfunctions during Recruit School firearms training, which is unacceptable, and I have suspended the transition to the Smith and Wesson M&P 9mm.
Even if the manufacturer is able to address our issues over the next week, we cannot afford to risk the extra training time that was added to address transition contingencies. Education, Training and Research will continue to work with the manufacturer on this issue, but today, Trooper Trainees will be issued Sig Sauer 357 handguns, which we have in our inventory as a precaution."
Leghorn summarizes: "But it appears that the latest wave of recruits in training have experienced an "unacceptable" number of issues with the new gun, and the department is rolling back the changeover, moving back to their tried and true SIG SAUER P226 pistols in .357 SIG." To which he adds: "To be fair to S&W, almost every time a major department transitions from one product to another there are problems."
See full article here:
Texas DPS Ditches S&W M&P Handguns Over Reliability Issues | The Truth About Guns
Hard not to take note that the M&P pistols were only being issued to new recruits (as best I can tell) and they were being used as the DPS's M&P beta testers. Previously from another source: "Department of Public Safety spokesman Tom Vinger said Smith & Wesson M&P 9 mm handguns will be issued to troopers finishing their training in January. Current troopers will be allowed to carry their .357-caliber SIG Sauer pistols while DPS expands availability of the new handgun."
The M&Ps were adopted as the new department service handgun, yet the transition was conditional based on the results of beta testing with recruits? Hmmm. I do wonder how many pistols were issued for testing? They kept their inventory of Sigs, rather than trade them in, so how committed to making a change were they? I can only speculate based on what I've read and what I understand to be true about the political reality of LE supplier contracts, but I wouldn't think it too great a stretch to believe Sig would continue to lobby to keep the .357Sig round alive and their pistol in DPS duty holsters. Could more free .357Sig ammo and a bunch of new pistols be enough to put the kabosh on an M&P deal, or is it possible the DPS did the recruit beta testing in order to force Sig to 'earn' their business? I don't know either way, but I do know that politics are hard to completely remove from these sort of negotiations.