Hello provided you have a self-hosted environment, review these for clues:
(env) frappe@ubuntu1804lts:~/frappe-bench$ find logs -name ‘*.log’ | xargs ls -alh
-rw-r–r-- 1 frappe frappe 19K Mar 13 23:25 logs/bench.log
-rw-r–r-- 1 frappe frappe 12K Feb 3 20:50 logs/frappe.log
-rw-r–r-- 1 root root 21M Mar 19 16:24 logs/node-socketio.error.log
-rw-r–r-- 1 root root 378 Mar 20 00:11 logs/node-socketio.log
-rw-r–r-- 1 root root 0 Jan 12 01:08 logs/redis-cache.error.log
-rw-r–r-- 1 root root 32K Mar 20 00:11 logs/redis-cache.log
-rw-r–r-- 1 root root 0 Jan 12 01:08 logs/redis-queue.error.log
-rw-r–r-- 1 root root 34K Mar 20 00:11 logs/redis-queue.log
-rw-r–r-- 1 root root 0 Jan 12 01:08 logs/redis-socketio.error.log
-rw-r–r-- 1 root root 32K Mar 20 00:11 logs/redis-socketio.log
-rw-r–r-- 1 root root 0 Jan 12 01:08 logs/schedule.error.log
-rw-r–r-- 1 root root 9.6K Feb 3 20:45 logs/schedule.log
-rw-r–r-- 1 root root 23M Mar 21 14:44 logs/web.error.log
-rw-r–r-- 1 root root 2.6K Jan 26 15:30 logs/web.log
-rw-r–r-- 1 root root 8.7M Mar 20 00:12 logs/worker.error.log
-rw-r–r-- 1 root root 0 Jan 12 01:08 logs/worker.log
Within the app a search on Error Log may turn up clues