dolphin hangs on nfs client after nfs server goes down

On nfs client, I mount nfs4 share with options: user,noauto,soft,ro

When I shut the nfs server down to simulate network problems, the nfs client doesn’t hang thanks to the soft option. But dolphin never recovers from the server going down. When I force close dolphin and reopen it during the same kde session, dolphin hangs showing an empty gray screen. Tested this multiple times, always same result… Other programs using the filesystem have the same problem (like konsole). Other programs like firefox don’t have a problem…

What can I do so that dolphin doesn’t hang when server goes down?

I also tried adding intr option, but this made the nfs share browsing unstable while the server is still running.