30 Minute Game Problem

I'm unsure if this is the right place to post this. I apologise if I'm mistaken

I just played a 30-minute game. My opponent's moves were pretty much instant the entire way through, but as soon as I gained the upper hand (at about 25:00) my opponent stopped making moves. As far as I know, he hadn't disconnected. I waited for about five minutes, but there was nothing I could do (I tried chatting to him to make sure he wasn't just spending a long time thinking). After about ten minutes of waiting, I just resigned, because I wasn't anticipating waiting another 15 minutes to play another game.

I was just wondering if there is any way to avoid this or if there are any systems in place that attempt to prevent it?

maybe he got disconnected . it happens a lot in live chess