How to verify IMAP connectivity

Hi All

I need you help about IMAP connectivity, My scenario is

   i have an CRM which is connect with Gmail through IMAP Library ,

1)  My All Email receive both side (Gmail & CRM)

2)  i Check all Email Download CRM

but now i  observed that some time email not download  in CRM which receive through XYZ@gmail.com ( IMAP)and After Check CRM Server ihave not found any error ,

after start and stop POP Service in Gmail  i receive mail on my CRM Server

Kindly Suggest me how can track IMAP  Record

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Deepak Sharma New Delhi [INDIA]