My UAP-AC-LR's have been running for a month now, totally solid with great signal everywhere, seamless roaming between them too, before I had wifi calling disabled as I had drop outs unless I stayed still, now I forget that I'm using wifi calling.
I think someone recommended these a couple of years ago and I wish I had listened. I think it could have been bledd, I'm going to search my old threads now.
Edit - It was Pigeon_Killer, just over 2 years ago. I should have got 2 of these back then, instead I ended up with 3 x Asus N66u's. Now the 2 x UAP-AC-LR's are covering even better with the improved positioning.