Please follow the below template, it will help us to help you!
Expected Behaviour:
DNS working.
Actual Behaviour:
DNS not working, and web says "Lost connection to API"
Rebooted Raspberry and works again.
This pihole is the only one working as dns resolver and dhcp server.
Debug Token:
https://tricorder.pi-hole.net/xnzh86u8tp! (Dont know if last "!" is correct)
Sorry for my english.