Locking adguard also seems to have fixed this problem for me. Thanks Mark for testinh it out.Strictly speaking, my problem isn't that Adguard stops blocking ads. My problem is that Adguard is becoming disabled and has to be manually re-enabled, throughout the day.
OnePlus' update to Android 9 (Pie) has caused Adguard to stop functioning, on my OnePlus 6. The new "Always-on VPN" setting allows me to get a notification when Adguard is off, which is helpful. But I've set about trying to diagnose a permanent solution. I'm now on the nightly build, which is still producing the notification that Adguard is off.
pref.vpn.disable.reconfigure is already enabled.
Watchdog is set to 10.
Adguard has always been set to "Don't optimize" battery optimization.
Adguard is now "locked" into recents
Normally, I have Adguard notifications off, but I've turned them back on, until I figure out a better solution.
Are there any other ideas, as I see if any of these settings will cause a fix?