Sophos APX causes network loop

Hello everyone, 

unfortunately I have to open a thread. See the old one: Sophos APX causes network loop
It has worked fine for a few months, the problem shows up again. 

One of the APX is inactive
and no PC or notebook get´s an IP address from the DHCP server.

The solution is to disconnect the access points from the network. After that it works fine again.
I deleted the entire WLAN configuration, reset the Access Points and reconfigured it, but nothing helped.

Have anyone an idea?
If not i will open a ticket.

Thanks a lot :)

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[edited by: Erick Jan at 3:16 AM (GMT -8) on 9 Jan 2023]