Connection Closed for desktop 3.2.4

Hi i was wondering if someone could shed some light on the issue im having.
Currently updated from 18-21 and updated the client to the last version. we have an issue as on the client shows connection closed i thought it was the wifi so i connected directly to the LAN. We have ubuntu 18.04 with nginx and php7.3. These were the logs i was looking at
not sure if its a php issue or nginx?

Thank you

2021/08/02 10:58:48 [warn] 1758#1758: *99728 an upstream response is buffered to a temporary file /var/cache/nginx/fastcgi_temp/4/02/0000000024 while reading upstream, client: 192.168.0.132, server: cloud, request: "GET /remote.php/dav/files/jpg/Sxxres/JPG/xxx/-programas%20para%20instalar/apache-couchdb-3.1.1.msi HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.3-fpm.sock:", host: "cloud.domain.com"
2021/08/02 10:58:48 [warn] 1758#1758: *99724 an upstream response is buffered to a temporary file /var/cache/nginx/fastcgi_temp/5/02/0000000025 while reading upstream, client: 192.168.0.132, server: cloud, request: "GET /remote.php/dav/files/jpg/Sxxres/JPG/xxx/-programas%20para%20instalar/go1.16.6.windows-amd64%20(1).msi HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.3-fpm.sock:", host: "cloud.domain.com"
2021/08/02 10:58:49 [warn] 1758#1758: *99729 an upstream response is buffered to a temporary file /var/cache/nginx/fastcgi_temp/6/02/0000000026 while reading upstream, client: 192.168.0.132, server: cloud, request: "GET /remote.php/dav/files/jpg/Sxxres/JPG/xxx/-programas%20para%20instalar/mariadb-10.5.11-winx64.msi HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.3-fpm.sock:", host: "cloud.domain.com"
2021/08/02 10:58:58 [warn] 1758#1758: *99729 an upstream response is buffered to a temporary file /var/cache/nginx/fastcgi_temp/7/02/0000000027 while reading upstream, client: 192.168.0.132, server: cloud, request: "GET /remote.php/dav/files/jpg/Sxxres/JPG/xxx/-programas%20para%20instalar/postgresql-13.3-2-windows-x64.exe HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.3-fpm.sock:", host: "cloud.domain.com"
2021/08/02 10:58:59 [warn] 1758#1758: *99728 an upstream response is buffered to a temporary file /var/cache/nginx/fastcgi_temp/8/02/0000000028 while reading upstream, client: 192.168.0.132, server: cloud, request: "GET /remote.php/dav/files/jpg/Sxxres/JPG/xxx/xx/archivos/bin/WinSCP.exe HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.3-fpm.sock:", host: "cloud.domain.com"