So I was happily using El Capitan after updating from Mavericks last year, saw there was a stable update from El Capitan 10.11.0 to 10.11.2, updated, and ever since I’ve had an issue with WiFi connectivity.
Every 10 minutes or so, my WiFi seems to disconnect/reset, disturbing any downloads, Dropbox syncing etc I’m running.
After doing a quick Google search, I found a few threads including (https://discussions.apple.com/thread/7378542).
Since I didn’t have any backups (I’ve learned my lesson now – I’m now running Time Machine backups), after seeing they’d released a 10.11.4 beta version yesterday, I figured I’d update to the latest beta to see if that helped.
I enrolled in their Apple Beta Software Program, which allowed me to download the latest 10.11.4 beta, but that didn’t fix it either… so until Apple get their act together, I’ve got a USB to Ethernet adaptor on order.
On a side note, I’ve learned my lesson to make regular Time Machine backups!