Please post log of the same operation with FileZilla.
Does the problem happen if you downgrade to TLS 1.2?
Uploading and deleting large files/directories always fails on one of my web hosting accounts who uses pure-ftpd v1.0.51.
The connection disconnects every few seconds when using WinSCP and has to be re-established with Reconnect.
This happens only with WinSCP, other clients like FileZilla, SmartFTP and many more are working well with this web hosting service. I have already had this checked by the web host's support, they have not found any errors on their side.
Please note: I'm using WinSCP since many years and have some experience.