Audio Issues - Can't hear each other

Hi, tested the room I’m hosting a few times with mutiple participants. And every time there’s an sound issue that varies between me not hearing them, or they can’t hear me, or they can’t hear each other, or other permutations of this… It’s imtermittent. I’ve found that when they refresh, things sometimes work. I’m hosting an event today at 5pm. Please assist before that.