A couple times a year my four TP Link HS200 smart switches will spend a day or more constantly trying to stay connected to my wireless, or drop off for minutes at a time with a red wifi logo.  When they're on I see latency spikes to them up to 4000-5000ms and 75-90% packet loss.  These smart switches are all about 3 years old.  The issue is actually happening right now.  An HS100 smart plug I bought just a few months ago is experiencing the same issue along with the switches right now.  I'm not sure how to fetch the hardware/firmware versions of the switches and plugs, I'm guessing it's in the kasa app?  I just control these with my Alexa app so I'd have to see if my wife still has the kasa app on her phone.

No other wireless devices are affected EXCEPT for my Craftsman(Chamberlain?) garage door opener but its latency and packet loss are only about half as bad as the TP Link devices.  My smart phone and my wife's smart phone are fine, several raspberry pis are currently showing constant 1ms latency and 0% packet loss.  No hardwired devices are affected.  I am confident that it's not the access point or my network.  If it matters I'm running an Ubiquiti UAP-AC-LR access point with the latest firmware, and on the latest controller.

Why does this keep happening to my TP Link devices?  Full disclosure, I am a system & network administrator so we can skip past pretty much any network troubleshooting steps, not that I don't appreciate the help/tips of course.  Just don't want you to waste your time is all.

Thanks for taking the time to read my post.