Custom reports stopped sending out scheduled emails reports. The issue is observed for many users.
The cause seems to be due to very high number of reports, and also due to the size of some reports that are being generated.
1- Delete all custom reports that are not being actively used (not needed any more).
2- Review all custom reports that are needed, and see if you can reconfigure (delete/create new one with more precise information so that report size does not get very big, also giving some unique name to each report).
3- ASM DEV team also made a fix to improve report building process on the backend server. The fix will be deployed in future coming up release of ASM.