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Hi Markus, I don't think this is the issue, there has been recent reports of ssh connection issues for some users since the Raspberry Pi 3B+ was released. It may just need a line adding to the /etc/hostapd/hostapd.conf file for country code; country_code=GB
or your country. But as I can't reproduce the bug myself I can't resolve it yet. Raspbian does not use dhcp for networking it used dhcpcd instead so though dhcp is installed it is not active. It looks like the dhcp -r command releases the lease. This should happen during the switch as the interface is brought down which will refresh the lease when dnsmasq and the interface comes up.

If you haven't already set your wifi region in Raspberry Pi Configuration then update that, not that will change the hotspot situation but best to do that. And add the line to the hostapd.conf file. I will continue to see what changes are affecting some users.