eMClient inconsistent in DLing from gmail.com

DLd"s from gmail.com are inconsistent. One day I boot your program, and it DLds" a dozen or more emails’; the next day, with no changes, it won’t DLd ANY. I’m also getting IMAP error message saying it can’t access the account. I’ve checked settings and I can’t find any errors. 

Can you please post the error, without which it is difficult comment.