This is the error I see that relates to your issue:
Mar 23 07:52:03 Tower unassigned.devices: Error: shell_exec(/bin/df '/mnt/remotes/VEDA_Media' --output=size,used,avail | /bin/grep -v '1K-blocks' 2>/dev/null) took longer than 5s!
### [PREVIOUS LINE REPEATED 2 TIMES] ###
This is from the server dropping of-line or more likely a network issue.
You are also running 6.9 and you are using NFSv3 which has a lot of issues with remote shares being dropped. I order to use NFSv4 that is a lot more robust, you need to be running 6.10-RC3 or above and set NFSv4 in the UD Settings,
You have some other issues going on here also:
Mar 23 07:48:17 Tower kernel: traps: lsof[19515] general protection fault ip:14672eb76a9e sp:dbff8b74eba941f error:0
Mar 23 07:48:17 Tower kernel: traps: lsof[19616] general protection fault ip:14d601371a9e sp:50744c1256c0c217 error:0
Mar 23 07:48:17 Tower kernel: traps: lsof[19172] general protection fault ip:14aa3dc2ba9e sp:91585a64f396a3e8 error:0
Mar 23 07:48:17 Tower kernel: traps: lsof[20207] general protection fault ip:14df2b7c7a9e sp:5b116e228ef7db7f error:0
Mar 23 07:48:17 Tower kernel: in libc-2.30.so[14d601352000+16b000]
Mar 23 07:48:17 Tower kernel: in libc-2.30.so[14aa3dc0c000+16b000]
I have no idea what these are, but are probaby related because the remote share dropped off-line right after these log entries.