AqBanking

AqBanking Version: 5.7.6
Gwenhywfar: 4.18.0

HBCI URL setup command: aqhbci-tool4 adduser -s https://hbci11.fiducia.de/cgi-bin/hbciservlet -b 67230000 -u [MY_CUSTOMER_NUMBER] -N [MY_BANK_ACCOUNTNUMBER] -t pintan --hbciversion=300
Second setup command: aqhbci-tool4 adduserflags -f forceSsl3 -c [MY_CUSTOMER_NUMBER]

Now running getsysid with: aqhbci-tool4 -A -P pinfile getsysid -c [MY_CUSTOMER_NUMBER]

this fails since a few weeks with following error:

Locking users
Locking user [MY_CUSTOMER_NUMBER]
Executing HBCI jobs
AqHBCI started
There are no tan method descriptions (yet), trying One-Step TAN.
Encoding queue
Sending queue
Connecting to server...
Resolving hostname "hbci11.fiducia.de" ...
IP address is "195.200.35.18" 
Connecting to "hbci11.fiducia.de" 
Connected to "hbci11.fiducia.de" 
Using GnuTLS default ciphers.
TLS: SSL-Ciphers negotiated: TLS1.2:ECDHE-RSA-AES-256-GCM:AEAD
5:2018/03/19 19-47-39:aqbanking(2366):abgui.c:  165: Automatically accepting certificate [D8:CD:2B:25:0B:6E:97:7A:B2:F3:0D:52:1D:25:BF:A9]
Connected.
Sending message...
Message sent.
Waiting for response
Receiving response...
3:2018/03/19 19-47-39:gwen(2366):syncio_tls.c: 1336: gnutls_record_recv: -110 (The TLS connection was non-properly terminated.)
3:2018/03/19 19-47-39:gwen(2366):syncio_tls.c: 1354: Detected premature disconnect by server (violates specs!)
No message received
Error receiving response (-110)
AqHBCI finished.
3:2018/03/19 19-47-39:aqhbci(2366):provider.c: 1464: Job has no system id and no iTAN results
3:2018/03/19 19-47-39:(null)(2366):getsysid.c:  157: Error getting system id (-1)

For other bank accounts running against other banks it is running fine, but only this bank account it doesn't work. Any idea? I also contacted my bank, even the IT guys over there checked my case, they said, it must be the software, they didn't find any problem on their side.

This suddenly stopped working, i also tried reinstalling everything with latest, no luck.