Builder has stopped working

My free runner is currently suspended with these logs:

 2022-10-16T10:57:57.624 runner[06e82534ae0587] lhr [info] machine did not have a restart policy, defaulting to restart

2022-10-16T10:58:07.902 runner[06e82534ae0587] lhr [info] machine did not have a restart policy, defaulting to restart

2022-10-16T10:58:17.283 runner[06e82534ae0587] lhr [info] machine did not have a restart policy, defaulting to restart

2022-10-16T10:58:29.859 runner[06e82534ae0587] lhr [info] machine did not have a restart policy, defaulting to restart

2022-10-16T10:58:43.356 runner[06e82534ae0587] lhr [info] machine did not have a restart policy, defaulting to restart

2022-10-16T10:58:56.309 runner[06e82534ae0587] lhr [info] machine did not have a restart policy, defaulting to restart

2022-10-16T10:59:04.895 runner[06e82534ae0587] lhr [info] machine did not have a restart policy, defaulting to restart

2022-10-16T10:59:15.134 runner[06e82534ae0587] lhr [info] machine did not have a restart policy, defaulting to restart

2022-10-16T10:59:26.327 runner[06e82534ae0587] lhr [info] machine did not have a restart policy, defaulting to restart

2022-10-16T10:59:40.496 runner[06e82534ae0587] lhr [info] machine did not have a restart policy, defaulting to restart

2022-10-16T10:59:51.674 runner[06e82534ae0587] lhr [info] machine has reached its max restart count (10) 

I’m trying to deploy, nothing has changed since it worked in terms of deployment configuration. My logs from the CI:

$ /root/.fly/bin/flyctl deploy --remote-only
==> Verifying app config
--> Verified app config
==> Building image
Waiting for remote builder fly-builder-red-bird-7781...
WARN Remote builder did not start in time. Check remote builder logs with `flyctl logs -a fly-builder-red-bird-7781`
WARN Failed to start remote builder heartbeat: remote builder app unavailable
Waiting for remote builder fly-builder-red-bird-7781...
WARN Remote builder did not start in time. Check remote builder logs with `flyctl logs -a fly-builder-red-bird-7781`
Error failed to fetch an image or build from source: error connecting to docker: remote builder app unavailable
Cleaning up project directory and file based variables 00:00
ERROR: Job failed: exit code 1

I deleted the app from within the dashboard, reran my CI and it deployed fine. Looks like it had just died and didn’t recover.