Clientraw files stops uploading

3 days ago I saw that all clientraw had stopped uploading to the webserver. They were generated OK on my PC. I restarted WD, and the transfer started again. Since then, it has happened 2 more times. All other files uploads normally.
This is the first time this has happened since I started in 2008. I have not done any changes.
When it happened again today, I saw that it had stopped again 2 hours earlier. I checked ftprealtimelog.txt. The end of the file showed:
Logging off from server 09:36:04
QUIT
221 Logout.
OK
Disconnected.
Doing abort procedure/program close…

A little later the same file showed:
Real time Clientraw FTP, vers 10.2
Time/date:09:36:16 13.04.2025
Logging onto FTP server…ftp.runarweb.com
Connecting to FTP server at 46.30.211.192:21.
OK
Connected.
[10053] Software caused connection abort
Disconnected: [10053] Software caused connection abort
FTP error occured
FTP Uploading C:\wdisplay\webfiles\clientraw.txttemp - >clientraw.txt
143: Busy performing current action.
FTP Uploading C:\wdisplay\webfiles\clientrawextra.txttemp - >clientrawextra.txt
143: Busy performing current action.
FTP Uploading C:\wdisplay\webfiles\clientrawhour.txttemp - >clientrawhour.txt
143: Busy performing current action.
FTP Uploading C:\wdisplay\webfiles\clientrawdaily.txttemp - >clientrawdaily.txt
143: Busy performing current action.
301: Timeout.
Logging off from server 11:36:16
Doing abort procedure/program close…

Do any of you know what has caused this to happen? And what I can do about it?
I was running WD 10.37S152 from about a year ago. I just installed the latest version (the same build number) to see if it helps.

Try a power off reboot of pc to see if that sorts it

I did that after the first stop. It did not help.