imap - PHP imap_fetchbody returns always false after reading empty mailbox/folder although mail is existing

I am familiar with PHP but quite new to IMAP processing. I try to read a mailbox for getting the body processed. This is working fine until the mailbox runs empty. After the first access to the empty INBOX (or even any folder or subfolder of the mailbox, I tried several settings), the imap_fetchbody() always returns false althought the box contains new mails again.

This is my code:

$imap = '{imap.strato.de:993/imap/ssl/novalidate-cert}INBOX';
$user = 'myuser';
$pass = 'mypassword';
$imapStream = imap_open($imap, $user, $pass);
$mailIds = imap_search($imapStream, 'ALL', SE_UID, 'ISO-8859-1');
foreach ($mailIds as $mailId) {

    $info = imap_mailboxmsginfo ( $imapStream );
    $body = imap_fetchbody ( $imapStream, $mailId, '1');
    if($body) {
        ... do something with the body ...
    }
    imap_delete($imapStream, $mailId, FT_UID);
}
imap_close($imapStream, CL_EXPUNGE);
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