Anyone know more about DASDelegateServices?

If you read diagnostic logs you will see thousands of things that you won’t be able to understand. Logs aren’t meaningful to mere mortals like us; they are for Apple engineers who have the iOS data dictionary, and even they don’t read the raw logs, they have apps that scan the logs and report anything that needs attention.

The explanation that you found on Google is about right, but the problem with Google is 99% of the content on the web is wrong, misleading, a scam. There is absolutely no fact checking on the web, and anyone can post anything they want to. You chanced on something that is reasonably factual, by pure luck. But it has nothing to do with your issue. What happened was iOS crashed. While it is called an iPhone, it is actually a very powerful pocket-sized computer that can incidentally make phone calls. And like all computers, it will crash occasionally, and that’s what happened. To minimize the probability of that happening it may pay to restart it occasionally→Restart your iPhone - Apple Support; maybe once a week or so.

When you say it restarted, did it go back to the Home screen, or did it display an Apple logo and restart from scratch, requiring you to enter your passcode again? If it just went back to the Home screen that is called a Springboard crash; the Springboard is the internal app that displays the Home screen; they can be caused by an app that misbehaved, or a network glitch. If it restarted that was a genuine iOS crash.

If it happens repeatedly the most common cause is a failing battery.