We have recently migrated to Odoo 16 and we are encounter an issue with the CRONs.

They are not executed automatically and after I restart the web machine, they go back to working normally and stop after some time.

After some digging in the code, we have found that the " ir_cron._process_jobs" stops working and returns this error: SSL SYSCALL error: Connection timed out

2024-03-22 11:06:32,934 1 WARNING ? odoo.service.server: ____________ ir_cron._process_jobs
odoo-stack      | Exception in thread odoo.service.cron.cron0:
odoo-stack      | Traceback (most recent call last):
odoo-stack      |   File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner
odoo-stack      |     self.run()
odoo-stack      |   File "/usr/lib/python3.9/threading.py", line 892, in run
odoo-stack      |     self._target(*self._args, **self._kwargs)
odoo-stack      |   File "/usr/lib/python3/dist-packages/odoo/service/server.py", line 499, in target
odoo-stack      |     self.cron_thread(i)
odoo-stack      |   File "/usr/lib/python3/dist-packages/odoo/service/server.py", line 469, in cron_thread
odoo-stack      |     pg_conn.poll()
odoo-stack      | psycopg2.OperationalError: could not receive data from server: Connection timed out
odoo-stack      | SSL SYSCALL error: Connection timed out
odoo-stack      |
odoo-stack      | Exception in thread odoo.service.cron.cron1:
odoo-stack      | Traceback (most recent call last):
odoo-stack      |   File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner
odoo-stack      |     self.run()
odoo-stack      |   File "/usr/lib/python3.9/threading.py", line 892, in run
odoo-stack      |     self._target(*self._args, **self._kwargs)
odoo-stack      |   File "/usr/lib/python3/dist-packages/odoo/service/server.py", line 499, in target
odoo-stack      |     self.cron_thread(i)
odoo-stack      |   File "/usr/lib/python3/dist-packages/odoo/service/server.py", line 469, in cron_thread
odoo-stack      |     pg_conn.poll()
odoo-stack      | psycopg2.OperationalError: could not receive data from server: Connection timed out
odoo-stack      | SSL SYSCALL error: Connection timed out
odoo-stack      |
odoo-stack      | Exception in thread odoo.service.cron.cron2:
odoo-stack      | Traceback (most recent call last):
odoo-stack      |   File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner
odoo-stack      |     self.run()
odoo-stack      |   File "/usr/lib/python3.9/threading.py", line 892, in run
odoo-stack      |     self._target(*self._args, **self._kwargs)
odoo-stack      |   File "/usr/lib/python3/dist-packages/odoo/service/server.py", line 499, in target
odoo-stack      |     self.cron_thread(i)
odoo-stack      |   File "/usr/lib/python3/dist-packages/odoo/service/server.py", line 469, in cron_thread
odoo-stack      |     pg_conn.poll()
odoo-stack      | psycopg2.OperationalError: could not receive data from server: Connection timed out
odoo-stack      | SSL SYSCALL error: Connection timed out

The web and database server are separate and we have one database.

The application is used by approximately 450 users and you can find below some of the conf file info

limit_memory_hard = 26843545600000
limit_memory_soft = 21474836480000
limit_request = 8327680000
limit_time_cpu = 480
limit_time_real = 1000000
limit_time_real_cron = -1
list_db = True
log_db = False
log_db_level = warning
log_handler = :INFO
log_level = warn
logfile = 
longpolling_port = 8072
max_cron_threads = 2
osv_memory_age_limit = False
osv_memory_count_limit = False
pg_path = 
pidfile = 
proxy_mode = False
reportgz = False
screencasts = 
screenshots = /tmp/odoo_tests
server_wide_modules = base,web
smtp_password = False
smtp_port = 25
smtp_server = localhost
smtp_ssl = False
smtp_user = False
syslog = False
test_enable = False
test_file = 
test_tags = None
transient_age_limit = 1.0
translate_modules = ['all']
unaccent = False
upgrade_path = 
without_demo = True
workers = 0

This issue is blocking our workflow. Your input is really appreciated.

Thank you in advance