Description:
------------
Only sometimes, but once I get it, most of the next times, when I call imap_mail_move within a loop over the mails in an imap folder it returns 0 though it shouldn't!  
  
In the next iteration of the loop I get the Notice:
  Notice: Unknown: No matching messages (errflg=2) in Unknown on line 0
probably at the next imap function (imap_headerinfo).

I also think, though it is a Notice, it manages to not completely let my loop finish all the remaining iterations.

Reproduce code:
---------------
..
$cmails=imap_num_msg($imap);
for ($i = 1; $i <= $cmails; $i++) { 
	set_time_limit(120) ;
	$header = imap_headerinfo($imap, $i);
	..
	imap_mail_move($imap, $i, 'OLT Incomplete');
	..
}

Expected result:
----------------
for all messages to be moved to 'OLT Invomplete'
(with some conditions of course, but for simplicity not mentioned)

Actual result:
--------------
-----------------START-----------------
Connected to mailserver
  Found 4 messages. Reading unread..
  Reading unread e-mail (nr. 1)..
    IS a license request.
    Request has all the MINIMUM information. Putting into OLT..
      Checking USER
        User found by e-mail!
        User ID=16691
        User (ID:16691) doubted and updated as such!
        E-mail sent to user to activate account.
      Checking LICENSE
        Using License Number: 0330100000118
        License created in DB! (ID:34458)
        License key on Hold.
    Request successfully added in OLT! (Moved to imap folder 'Completed')
  Reading unread e-mail (nr. 2)..
    IS a license request.
    Request has all the MINIMUM information. Putting into OLT..
      Checking USER
        User not found.
        User (ID:16691) doubted and updated as such!
        E-mail sent to user to activate account.
      Checking LICENSE
         Country is unknown (no invoice would be made (Could not move to imap folder 'Incomplete')
------------------END------------------

Notice: Unknown: No matching messages (errflg=2) in Unknown on line 0