Why does Beanstalkd workers restart??

Question

Message Queues

Good day!
The website written in Yii2 runs Beanstalk workers.
For some reason, all workers are forced to restart every 50-60 seconds. Because of this, the minimum priority queue builds up faster than the workers can complete it.
in the logs of the worker, before completion, the following text appears:

Received signal 2.
Exiting...

Nowhere did I find this period, according to which restarts can occur.
Example config in Supervisord:

command=/home/socialf/public_html/app/yii pinterest-job
numprocs=1
process_name=%(process_num)02d
autostart=true
autorestart=true
startsecs=1
startretries=3
user=root
redirect_stderr=true
stopsignal=INT
stdout_logfile=/home/socialf/public_html/app/console/runtime/logs/%(program_n$
stdout_logfile_maxbytes=1MB
stdout_logfile_backups=10

What could be the problem? In which direction to dig?
Thanks in advance!