I think any quality gun should be able to go a long time without cleaning.
I have one 1911 that I fired 749 rounds (one round was buggered from the factory or it would have been 750) in one sitting. No cleaning and no extra oil. I would have done more, but I just ran out of ammo.
My favorite gun finally had a malfunction at round 8,103. The extractor broke. Funny thing, the gun continued to operate, but I got a Type III malfunction. I cleared it and continued to shoot. Then, about 20 rounds later, I got another Type III. This caused me to look closer and I saw this:
That it continued to operate is amazing to me. I would have thought it would have a Type III on every shot.
Anyway, I completely agree that the M&P should go a long way without needing cleaning and without malfunction. You shoot a lot more than I do. I just don't have the time or money to shoot that much. I hope you get your issue fixed.