1. Your Client task "On-Demand Scan - Quick Scan" is schedule to start every day at 12:00AM.
2. Your Client task "On-Demand Scan - Quick Scan" is depeneded on the Endpoint Security threat prevention -> On-Demand Scan, quick scan tab.
3. My suggestion is to check the Schedule scan option it may be to to scan only when the system is idle. Chances are your servers are busy during 12.00 AM and the its not idle the on-demand scan doesnt start.
Solution is to remove tick under schedule scan option to SCAN ANYTIME. This will adhere to the schedule 12:00AM start and quick scan should work.