Never noticed I had notifications being saved to flash. If I disable this, these errors stop.
This is showing in the phplog file every three seconds:
[09-Mar-2024 21:02:42 America/Chicago] PHP Fatal error: Uncaught TypeError: date(): Argument #2 ($timestamp) must be of type ?int, string given in /usr/local/emhttp/plugins/dynamix/scripts/notify:236 Stack trace: #0 /usr/local/emhttp/plugins/dynamix/scripts/notify(236): date('m-d-Y H:i', '') #1 {main} thrown in /usr/local/emhttp/plugins/dynamix/scripts/notify on line 236