Can you answer 2 items for the FAQ:
1. Is there a simple test to know if a router is infected?
2. Upgrading to 6.37.5+ cures an infection or it only prevents infection?
There is no dns server setting in the dhcp network. That could be a problem.# Setup DHCP Network
/ip dhcp-server network add address=192.168.10.0/24 gateway=192.168.10.1
Yes and latest fw.Are you running 5.21rc1?I'm seeing the same thing.
/ip hotspot ip-binding add type=bypassed server=<hotspot instance name> mac-address=<mac> disabled=no