SUMMARY

I have a mount point, e.g. /mnt/nas/public

If I auto mount it using systemd, e.g.

[Unit]
Description=nas public mount using cifs
Requires=network-online.target
After=network-oneline.target

[Mount]
What=//192.168.0.123/Public
Where=/mnt/nas/public
Type=cifs

[Install]
WantedBy=multi-user.target

and then switch off the NAS drive, and re-open dolphin, it pauses for a while.  

Dolphin didn't do this under kubuntu 20.04 LTS, but does in kubuntu 21

STEPS TO REPRODUCE
1.  Create a NAS mount point in systemd
2.  cd to it in the terminal to mount it
3.  open dolphin and it should open instantly
4.  switch off NAS and sleep PC, and resume
5.  open dolphin and it pauses for seconds

OBSERVED RESULT

Dolphin pauses, window refresh doesn't happen.

EXPECTED RESULT

Dolphin should not pause

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
Operating System: Kubuntu 21.04
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-18-generic
OS Type: 64-bit
Graphics Platform: X11
Processors: 32 × AMD Ryzen 9 3950X 16-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: Radeon RX 560 Series


ADDITIONAL INFORMATION

kubuntu 20.04 LTS didn't do this.