Ive seen numerous AKs, and Tavors, and SCAR 16's or whatever go down lol.
Bottom line is, if it gets hot and dirt enough, no matter the platform it will go down.
As for me, the ONLY time ive ever had an AR15 go down hard was from shooting in an old silica sand mine pit (was doing a lot of prone shooting on my side) and silica sand pebbles got everywhere, in the gun, and mags etc. and on day three of the class after close to 2,000 rounds fired I got some pebbles down in side the trigger assembly which gummed it up.
Other than that, many thousands of rounds through different guns and never had any problems... ever that were gun related and not ammo related.
If you are having that many problems with the AR15 platform either you have one from the late 60's-early 70's when they were built improperly and against the engineered recommendation design specs, you're going by anecdotal stories from someone else or you had a POS probably commercial spec or improperly spec'd home built gun to start with.
never had any problems with my BCMs, Daniel Defense, or Noveske guns. (or my Armalite or early production, Rock River Arms that I had). Also had a Stag Arms commercial spec gun but I didnt have enough rounds through it to really vet it before I sold it for another BCM).
Bottom line is, if the AR15 was the giant unreliable POS that some people say they are, I wouldn't have the 10 or so in my collection over the years and I would just have more AK's or other X,Y,Z platform gun.

(but I still have 4 AK platform guns too just because I like guns

)
But that's the great part about America... you can have whatever you want.
:usa:
(assuming the democraps dont get their way)