Do you have Pi-hole installed on your Umbrel?
I was having the same issue with auto updates, and realized that Pi-hole DNS settings mess up some Umbrel apps as well as the update process.
I just uninstalled Pi-hole and auto update is working again.
For reference:
http://community.umbrel.com/t/mempool-space-not-working-after-upgrade-to-0-4-10/5641/4