Zapped - AIR investigation failed

Hello,

We had some AIR related to zapped malicious email, but all the steps in the investigation log are failed. And I don't find any way to restarting it or what I can do to fix it ?

Note : I know i can go in threat explorer and create a manual remediation/investigation. But after 10 AIR failed like that, i suppose that this functionality has an issue and need to be fixed. The automated zero-hour purge is important.