Not that I could see.Do you have anything in the logs?I just did this upgrade on two RB411GL boards and they didn't come up after the reboot/upgrade. I had to hard power them off at the sites and power them back on.
Can you post some screen shots of your config?one more thing. If that dont help try one addition thing. Disable all data rates for N and use AC only and set the mc7 for basic and all chains. This will get you less transmit errors if you have interference.
I dont think so. It developed problems on its own. Playing with the power settings didn't make it better or worse. It continued to work just poorly.If you've played with the power settings you've most likely fried the card if it wasn't already.