Mac Wifi Issues after running Disc Cleaner

Mark, Mac OS support… Please click on the following link (http://avgclick.me/AVGtechnical) and choose Yes for the Question "Are you currently using any paid/trial AVG products?" inspite of using the Free version and fill out your details, select as Mac OS then the name of AVG Program that you installed in your device and in description please completely explain about your issue and finally click on the 'Start Chat' option. You will start a live, online chat with one of the AVG agents. 
AVG Guru

Hello Mark,
To fix the issue, we suggest contacting 'Apple' support or to restore backup where WiFi was working fine. Thank you.

After running AVG Disc Cleaner for MAC on my 2012 Mac Pro / latest El Capitan versions, I can no longer retain wifi for more than a few seconds at a time.  Any solutions.  El Capitan has known WIFI issues but none of the online solutions have worked. 

Hello Mark,
To fix the issue, we suggest contacting 'Apple' support or to restore backup where WiFi was working fine. Thank you.

Mark, Mac OS support… Please click on the following link (http://avgclick.me/AVGtechnical) and choose Yes for the Question "Are you currently using any paid/trial AVG products?" inspite of using the Free version and fill out your details, select as Mac OS then the name of AVG Program that you installed in your device and in description please completely explain about your issue and finally click on the 'Start Chat' option. You will start a live, online chat with one of the AVG agents. 
AVG Guru