Notification Email Suddenly not working on contract expired

Notification Email Suddenly not working on contract expired

Hi , 

As seen on title, please help ,
Notification Email Suddenly not working on contract expired since one month ago , before that time, it's running normally , 
but for email notification if any new request create is running normally , just only for contract expiry , it's not working , 

Please help how to fix it .

Regards,

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