Intermittent Email Issue in HPSM9.40

Dears,

we are facing intermittent email issue in HPSM9.40, HPSM stops sending an email to end users and it sends email after i restart the services, i have checked the EMAILOUT processsor from scheduler and idle time shows more than 14 days, once i restart the sservice then EMAILOUT idle starts and then it hangs, but after few days SM stops sending an emails to endusers, this is very critical issue for us,

 

Kindly help to resolve this issue.

 

Thanks,

JAgan