yes, buster, RPi3B+ or 4?
the hat is being recognized on boot then being removed.
would you be comfortable uploading your config.txt file & a fresh dmesg boot log?
config.txt location == /boot/config.txt
for dmesg >
- sudo dmesg -C, then reboot.
- at terminal session: sudo su
- dmesg -T > /var/log/dmesglog.txt (or whatever path & file name you like)
- exit (gets you out of root)
Thanks