It's not true, that RB912 + R11e-5HacD is not working.
We have more than a hundred sets and all of them are working correctly. Uptime are a few months.
interesting to see if some setting you have implemented or some circumstance of your installation has saved you from that issue
some users facing issue with 802.11ac card say that is a power supply issue because pcie card consume too much power an causes crash
how are you powering your rb912+r11e-5hacd?? poe?? which poe injector?? voltage supplied??
how many tx power are setting on integrated radio and additional radio??
thanks for your attention