Every Sunday at 4am pi-hole stops responding to DNS queries

[yubiuser]

Sounds a lot like this issue:

DNS resolution unexpectedly stops after upgrade to 5.0

Please follow the below template, it will help us to help you! If you are Experiencing issues with a Pi-hole install that has non-standard elements (e.g you are using nginx instead of lighttpd, or there is some other aspect of your install that is customised) - please use the Community Help category. Expected Behaviour: DNS resolution should work continuously. Hardware: Raspberry Pi 3 Model B Plus Rev 1.3 OS: Raspbian 9.11 Actual Behaviour: Periodically pihole will stop responding to DNS quer…

Background: gravity update runs every sunday, afterwards the the regex entries are re-read. Somehow sometimes this takes very long and DNS resolution fails for that time.