We don't know anything for sure, it's just speculation that it's overpopulation of those two worlds.

Ultimately it's also nothing to do with us, it's in SE interest to get the servers as stable as possible, but they're not obligated to give us a breakdown of what exactly the problem is and really it's none of our business. We're customers paying a subscription, we don't need to know how it's not working, just if it's working or not.

SE also won't want the hassle from fixing them non-stop and they certainly don't want the bad publicity from servers going up and down all the time so I'm sure they're doing their best to work on a permanent solution.