Ludolph sometimes disconnects himself from the xmpp server

[secult]

This happens to me once in a while, resulting in disconnect of the bot from the xmpp server. Bot has to be restarted manually then.

sep 29 18:02:11 mon ludolph[11243]: 2017-09-29 18:02:11,670 INFO     sleekxmpp.xmlstream.xmlstream: Waiting for </stream:stream> from server
sep 29 18:02:17 mon ludolph[11243]: 2017-09-29 18:02:17,758 ERROR    sleekxmpp.xmlstream.xmlstream: Could not connect to ----omitted----. Socket Error #111: Connection refused
sep 29 18:02:29 mon ludolph[11243]: 2017-09-29 18:02:29,414 INFO     sleekxmpp.xmlstream.xmlstream: Negotiating TLS
sep 29 18:02:29 mon ludolph[11243]: 2017-09-29 18:02:29,414 INFO     sleekxmpp.xmlstream.xmlstream: Using SSL version: TLS 1.0
sep 29 18:02:29 mon ludolph[11243]: 2017-09-29 18:02:29,485 WARNING  sleekxmpp.xmlstream.cert: Could not find pyasn1 and pyasn1_modules. SSL certificate COULD NOT BE VERIFIED.
sep 29 18:02:29 mon ludolph[11243]: 2017-09-29 18:02:29,662 INFO     sleekxmpp.features.feature_bind.bind: JID set to: ludolph@----omitted----
sep 29 18:02:29 mon ludolph[11243]: 2017-09-29 18:02:29,671 WARNING  sleekxmpp.xmlstream.cert: Could not find pyasn1 and pyasn1_modules. SSL certificate expiration COULD NOT BE VERIFIED.
sep 29 18:02:59 mon ludolph[11243]: 2017-09-29 18:02:59,681 WARNING  sleekxmpp.xmlstream.handler.waiter: Timed out waiting for IqWait_ff00ec05-153b-47af-a778-ff8da3ba834c-22
sep 29 18:03:29 mon ludolph[11243]: 2017-09-29 18:03:29,695 WARNING  sleekxmpp.xmlstream.handler.waiter: Timed out waiting for IqWait_ff00ec05-153b-47af-a778-ff8da3ba834c-23
sep 29 18:03:29 mon ludolph[11243]: 2017-09-29 18:03:29,696 ERROR    sleekxmpp.xmlstream.xmlstream: Error processing event handler: <bound method LudolphBot._session_start of <ludolph.bot.LudolphBot object at
sep 29 18:03:29 mon ludolph[11243]: Traceback (most recent call last):
sep 29 18:03:29 mon ludolph[11243]: File "/usr/lib/python2.7/site-packages/sleekxmpp/xmlstream/xmlstream.py", line 1708, in _event_runner
sep 29 18:03:29 mon ludolph[11243]: func(*args)
sep 29 18:03:29 mon ludolph[11243]: File "/usr/lib/python2.7/site-packages/ludolph/bot.py", line 795, in _session_start
sep 29 18:03:29 mon  ludolph[11243]: self.client.get_roster()
sep 29 18:03:29 mon  ludolph[11243]: File "/usr/lib/python2.7/site-packages/sleekxmpp/clientxmpp.py", line 263, in get_roster
sep 29 18:03:29 mon  ludolph[11243]: response = iq.send(block, timeout, callback)
sep 29 18:03:29 mon ludolph[11243]: File "/usr/lib/python2.7/site-packages/sleekxmpp/stanza/iq.py", line 233, in send
sep 29 18:03:29 mon ludolph[11243]: raise IqTimeout(self)
sep 29 18:03:29 mon  ludolph[11243]: IqTimeout
sep 29 18:03:29 mon  ludolph[11243]: 2017-09-29 18:03:29,697 ERROR    sleekxmpp.basexmpp: Request timed out: <iq type="get" id="ff00ec05-153b-47af-a778-ff8da3ba834c-23"><query xmlns="jabber:iq:roster" /></iq>
sep 29 18:03:29 mon  ludolph[11243]: 2017-09-29 18:03:29,698 WARNING  sleekxmpp.basexmpp: You should catch IqTimeout exceptions