I switched a section of my network over to it a few weeks ago, and I've been having constant random internet issues since, and when I swap back to the Pi-Hole the problems go away.
Is there some trickery to getting AdGuard to run stable? I have it running as an Add-On to Home Assitant, so I'm not sure if that's causing the issues, but I get lots of failed DNS queries, slowdowns, etc when going through AdGuard.
Not that I know of. I'm running on a pi3b and never had issues. I suggest raising a GitHub issue, they're usually pretty quick to respond and quick to fix bugs.
Is there some trickery to getting AdGuard to run stable? I have it running as an Add-On to Home Assitant, so I'm not sure if that's causing the issues, but I get lots of failed DNS queries, slowdowns, etc when going through AdGuard.