Not sure if anyone is encountering similar problems but just gona post here
After testing out for a few weeks, it seems that when i turn on private DNS or apps that uses VPN functionality ,to re-route to specified DNS servers, and sleep standby optimization at the same time, both my OP13 and my old OPPO will start to drain 20% over night.
What i have turned on / enabled
- WIFI
- 4/5G Data
- Bluetooth connected to smartwatch
Custom DNS in question - ControlD and NextDNS
Full fledge VPN - With sleep standby optimization
Paid VPN turned on, connected to SG server using its own DNS - no issue
Paid VPN turned on, connected to SG server using configured private DNS option - Overnight drain 19-20%
Full fledge VPN - Without sleep standby optimization
Paid VPN turned on, connected to SG server using its own DNS with pr - no issue
Paid VPN turned on, connected to SG server using configured private DNS option - no issue
DNS apps that uses VPN functionality - With sleep standby optimization
RethinkDNS app with DoH or DoT in Firewall mode - Overnight drain 19-20%
ControlD app with DoH - Overnight drain 19-20%
ControlD app with DoH/3 - Overnight drain 19-20%
DNS apps that uses VPN functionality - Without sleep standby optimization
RethinkDNS app with DoH or DoT in Firewall mode - No issue
ControlD app with DoH - No issue
ControlD app with DoH/3 - No Issue
The wierdest thing is that no apps is detected as running on batteryguru or the built in battery app and it just seems that for some reason with sleep standby optimization, my internet is totally killed and the DoT or DoH keeps trying to resolve itself or that some app is trying or spamming dns resolution.