Horizon not processing queues

Hi all, I've encountered a problem this morning with Horizon on my server hosted on Digital Ocean. I had no problems yesterday but since this morning Horizon is not processing any queues. I have supervisord setup on the server and this is the Horizon configuration

[program:horizon]
process_name=%(program_name)s
command=php /path/to/my/working/dir/artisan horizon
autostart=true
autorestart=true
user=my_user
redirect_stderr=true
stdout_logfile=/var/log/horizon/horizon.log

If i look at the log it says 'Horizon started successfully' and in the Horizon dashboard it says active but there's no process running. All the jobs keep being in the pause state without starting. This is my config.horizon for production environment

'environments' => [
        'production' => [
            'supervisor-1' => [
                'connection' => 'redis',
                'queue' => ['default', 'social'],
                'balance' => 'simple',
                'processes' => 5,
                'tries' => 3,
            ],
        ],

Redis is up and running with no problem so I don't think it is related to that. What do you think could be the problem ?