Once again, screen freezing episodes lasting 3-5 seconds randomly occur to me in WOW classic. Such issue cyclically appears every two-three months and inexplicably disappears after a few weeks, probably after some updates. As far as I know the problem affects many users and never has had a reliable explanation by anyone, either Blizzard or gamers. All suggestions up to day result regularly useless. Does anyone have any new ideas on this matter?
I would suggest that you try the troubleshooting steps mentioned in here, for this issue.
For additional help please post in the dedicated tech support WoW forums.