502 Bad Gateway, Random

I’m receiving a 502 bad gateway error. My app works fine for about an hour and then is followed by another hour of 502s. The app has been up for about a year and I’m not sure what the issue is as this is the first time it’s happening. I’ve checked my pool size and that seems fine. I don’t know where else to turn. Is the problem that is happening where other devs can’t launch their apps related?