Policy "suddenly" no longer triggered an event

Hi,

The policy ID: 18716301 Account: 11368 did’nt trigger an event yesterday. Without reason, or I can not see any reason.
The metric:
image

The policy (sorry for unstitched screenshot)



It worked in the past. No changes made.

After again saving the policy (without changes) it works and event is triggered.
This is really annoying, of course.

Thanks and regards
Phil