Unfortunately you have been sold a bill of goods, meaning you have been snookered into thinking Mac OS benefits by having a third part AV app installed.
Mac OS is catlike in that it cleans itself, Mac OS does not benefit from nor does it require any of the following types of third party apps:
· Antivirus Apps
· Cleaning Apps
· Security Apps
· VPN Apps
· Maintenance Apps
What these types of apps do is the exact opposite of what users want. They make Mac OS slow, appear buggy, can damage Mac OS and sometimes create unwanted behaviors. In short, they are really bad news!
So the first order of business for your computer is that you need to locate the developers. uninstall instructions for MacBooster 8 and please uninstall MacBooster 8. Because that app is pretty nasty stuff it tends to leave parts behind after being uninstalled, a testimony to how poorly written the app is! To fully ensure you have uninstalled it please download the free version of FindAnyFile directly from the developer. Then have it search your system for the following:
· MacBooster 8
Have it Trash any files with those names in them and then ensure the Trash is empty.
The behavior your Mac is experiencing is being caused by the very antivirus app you installed!