Please follow the below template, it will help us to help you!
“pihole-FTL” service should keep running.
I was having an issue with “illegal repeated keyword at line 33 of /etc/dnsmasq.d/01-pihole.conf” and finally realized that I had made a copy of 01-pihole.conf in that same directory. Once I deleted the “bkp” file, “sudo service pihole-FTL restart” worked. But, over the last 24 hrs or so, “pihole-FTL” has stopped twice. I ran the debug after restarting pihole-FTL.