diff --git a/ansible/roles/gitea_runner/templates/runner-healthcheck.sh.j2 b/ansible/roles/gitea_runner/templates/runner-healthcheck.sh.j2
index 3df68a1..c86528e 100644
--- a/ansible/roles/gitea_runner/templates/runner-healthcheck.sh.j2
+++ b/ansible/roles/gitea_runner/templates/runner-healthcheck.sh.j2
@@ -234,7 +234,10 @@ if [[ "$disk_pct" -ge {{ gitea_runner_healthcheck_disk_critical }} ]]; then
         | awk '{print $1}' \
         | xargs -r docker rm -f 2>/dev/null || true
     docker system prune -af --volumes || true
-    docker network prune -f || true
+    # Prune networks older than 1 hour only — removing ALL networks can
+    # race with Gitea Actions jobs that are mid-startup (network created
+    # but container not yet attached), causing "network not found" errors.
+    docker network prune -f --filter "until=1h" || true
     docker builder prune -af || true
     disk_pct=$(df -P / | awk 'NR==2 {gsub(/%/, "", $5); print $5}')
     echo "INFO: Disk usage after full prune: ${disk_pct}%"