Pi-hole should be blocking DNS querries and acting as the DHCP server for all clients on the network.
Actual Behaviour:
Pi-hole suddenly kicks every single clinet from the network, no device able to gain an IP and then it causes High CPU and I/O Delay. and even wen a device is able to gain an IP DNS resolution is either slow or nothing is resolved at all.
Thia happens every morning around 7-8 AM and a restart of the Pi-hole LXC is required to have it return to normal behavior
After weeks of research I found a Reddit thread talking about database issues on migrations from v5 to v6 and so I went through the logs for FTL and found database locked errors that happen every mornig and at random times.
I did a backup and deleted the database hoping this would resolve the issues but it kept happening so I I exported my settings and other necessary data via the teleporter and then deleted pihole completely.
installed a fresh install of v6 and imported my settings and data.
been running this for one week and so far it's stable with no issues.