Destination Disk Full (pseudo) error when trying to upload files

Hi,
I have been using WinSCP for some years now (2-3) to upload files to my hosted website.
Settings: FTP, Encryption TLS/SSL Explicit; Host name, Port# and Username already entered.
When I connect, I only input the password and then press the Login button to connect.
So far, no problems.

Problem:
I installed the software (a) manually (downloaded+installation) from website and, more recently (today), (b) downloaded from Windows Store and installed by Windows 10.

BOTH versions display the following error (starting from 30 mins ago) when I try to upload files:
"Copying files to remote side failed.
Disk full - please upload later".

I switched to uploading my files using the (less user friendly) utility of my Web Hosting Provider and it works flawless.

What is the problem ?

Regards,
Mike

What is that utility like? Is it also an FTP client application? Or some web-based thing?
Can you post WinSCP session log file?

Hi Martin,
Today, after rebooting my computer, WinSCP works (so far :) - I uploaded 4 or 5 files in the last 20 minutes.
The utility I used is File Manager from a web app called CP that web hosting providers use to enable their customers to do everything related to their hosted site.

Regards.

It's unlikely that it was fixed by a restart of your local machine.
Something must have changed on the server meanwhile.