Connection Drops with SMB Servers on macOS Sequoia 15.1

Since the update to macOS Sequoia 15.1, I've had the problem that the connection disconnects with some SMB servers when copying large files from the server to itself. Copying files from the computer to the server works, as does copying from the server to the computer.

In other posts, the firewall has already been mentioned, but it is not active. Has anyone experienced a similar problem and found a solution? Making changes to the nsmb.conf file did keep the connection active, but it resulted in corrupted files being written, so it's not a viable solution.

The nsmb.conf that maintained the connection but resulted in corrupted files:

[default]

streams=yes

soft=yes

signing_required=yes

dir_cache_off=no

protocol_vers_map=6

port445=no_netbios

notify_off=yes

mc_prefer_wired=yes

The problem occurs with a Synology RS2418RP+ (DSM 7.2.1-69057 Update 3).

SMB Version client: SMB_3.1.1

Does anyone have a solution or a similar issue?