Hello K two, The original card is bad as it doesn't show up as installed in System Report. I started having the same issue on the original before it went south. The new "BT 4.0" card works when I delete wiFi and then reboot to add back WiFi but then "turns off" unable to turn back on. Could it be a firmware issue? It was noted by Finbarr Dnaipe that the latestest firmware (with High Sierra) is Boot ROM Version: 84.0.0.0.0. I have Boot ROM Version: 82.0.0.0.0. I believe the only way to get the latest firmware for MBP 8,2 is to format SSD, install High Sierra and subsequently have the firmware in an update then install/restore back to Catalina. I have done the High Sierra redo route a few weeks ago but my firmware remained at "82.00; I didn't see any update subsequent to High Sierra install Any suggestions? Thanks. BTW to respond to your post, I did remove/add WiFI in network preferences, reboot to regain WiFI and have had it on for the last 20'. The disconnect occurs at random times; goes off anywhere between 5'-120'. This occurred/occurs with old and new WiFI card. Could be a motherboard related issue? After all who knows although everything was fine until 2 months ago. The motherboard was replaced by Apple in 2016 under their dGPU-gate recall (to have their motherboard fail after just 6 months again)