Wifi drops after running ccleaner

I'm on a pc that's using wifi to connect to my home network, and for some reason, when I run CCleaner, it makes my connection drop and it behaves strangely. It seems like my connection is always different. Does anyone know why this is and how I can prevent it?

do you have DNS cache checked off. if so that might be the reason

This option was already unchecked. Anything else?