mutt does not download all email

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Hi, my problem is that mutt does not download all email but stuck on 9997/19347 (51%)
Those are the last lines of .muttdebug0

Content-Type: text/html; charset="iso-8859-1"

[2017-03-20 10:46:53] 5< )
[2017-03-20 10:46:53] parse_parameters: `charset="iso-8859-1"'
[2017-03-20 10:46:53] parse_parameter: `charset' = `iso-8859-1'
[2017-03-20 10:46:53] 5< a0011 OK FETCH completed.
[2017-03-20 10:46:53] IMAP queue drained