We use a VPN to get around geoblocking because we now live in a different country to our native homeland. We do this by using an iMac to connect to the internet via an ethernet cable. I then connect to the VPN service and share that connection with internet sharing from the iMac. How this works is I use internet sharing to share the VPN connection via the iMac's Wi Fi antenna.
This all works fine and has done for over a year. The only problem we've ever had is that the VPN connection does drop out sometimes. I'm used to this, and its always been a simple case of reconnecting to the VPN from the iMac and all is swell again. But for about a month now, whenever the iMac disconnects from the VPN the Wi Fi antenna is switched off and I can't switch it back on. I've tried everything I know such as Safe Mode, resetting PRAM and resetting SMC.
Nothing works except totally restarting the iMac. This is a pain because we have multiple users logged in and the VPN typically disconnects a couple of times a day.
How do I fix this?