This is the daqd restart procedure:
$ ssh fb1 sudo systemctl restart daqd_*
That will restart all of the daqd services (daqd_dc, daqd_fw, daqd_rcv).
The front end mx_stream processes should all auto-restart after the daqd_dc comes back up. If they don't (models show "0x2bad" on DC0_*_STATUS) then you can execute the following to restart the mx_stream process on the front end:
$ ssh c1<host> sudo systemctl restart mx_stream