DNS breaks after USER vpn tunnel disconnect and starting mgt vpn for some clients

[osiega001]

We have about ~110 Cisco Anyconnect clients and management vpn configured + anyconnect cisco umbrella.

Works fine for 99% of them.

For some we see the randomly following happening: (especially on newer machines)

- user tunnel connected.

- user disconnects tunnel manually

- in 1-2 minutes mgt tunnel is started automatically

After that for some clients DNS is broken. ping works to all segments. but no DNS.

To solve this: either reboot or run things like:
ipconfig /release
ipconfig /renew
arp -d *
nbtstat -R
nbtstat -RR
ipconfig /flushdns
ipconfig /registerdns

win10 20h2 x64, latest Anyconnect 4.9 asa 9.10.1.42

I'm clueless whats going on here for those few clients.

[garybrophy]

bit of a longshot here but were you able to resolve this in the end

I am having the exact same issue. A reboot may fix it for 5 minutes but DNS stops working again