Should I keep Freesync turned on in monitor and Adrenalin settings?

Should I keep both turned on or just turn on one or the other? I have freesync enabled in my monitor settings and my Adrenalin settings but I am worried its causing issues (black flashes) time to time in all games. One guy said it went away when he turned off Freesync, but my monitor is 165 hz so I def need Freesync in some form.