My iPhone is not synchronized for some period of time?

My iPhone is not synchronized for some period of time, (e.g. Email is not coming from 5pm to 10pm, but after 10 pm email is synchronized). Does anyone has the same experience? If you know the cause of this problem, can you let me know please?

Just get any type of phone besides an I phone! Get an android. Preferably the nexus 5 or HTC one

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