- The observed 500/502 errors are related to PHP application errors (TypeError),
- They are revealed or amplified by the shared PHP 8.3 environment,
- The infrastructure is not down (their server),
- The sites are working again after the PHP processes are automatically restarted.
A lasting fix involves:
- Updating/fixing the affected extensions,
- or adapting the code to PHP 8.3,
- possibly a more isolated environment if necessary (dedicated server).