Umbrel.local not reachable

I have Umbrel running on a raspberry 4. When I fill in Umbrel.local in the browser nothing is happening. The error message is ‘the server is not responding’ but when I fill in the ip number, 192.168…. Umbrel is reachable. I can log in. Also via Tor I can login. When I do a reboot I can login via Umbrel.local again. What could be the problem and how do I solve it without rebooting.

I installed a new sd-card. Hope that fix the problem.