Mail.app won't check mail sometimes...

so noticed 80% of time, mail.app won't check new mail. @ times, i'll go through entire day without receiving email when open app, come pops in 100+ emails.

however, noticed @ times, mail come in without opening app.

have set @ 15 minute check fetch on gmail , push icloud.

has else seen issue? dad noticed on 4s.

 

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