Dell 7567: Random stuttering/sound buzzing while playing videos, games, etc. (if charger is plugged in)

I get random buzzing noise with micro freezing when im playing videos or playing games if the charger is plugged in.
I did run diagnostics from SupportAssist but found no problem? I've only experienced buzzing noise whenever i suddenly connect my charger when im playing videos or gaming but now i think it gone worse.. 
I have all the latest drivers from dell and also updated the bios but still suddenly this problem appeared out of nowhere. Any help would be appreciated!

specs:
windows 10 creators update
i5 cpu
8gb ram
gtx 1050
1tb hdd