I’ve been testing Kaspersky on a Win10 machine and found an issue. When Kaspersky actively scans files in the current folder of File Explorer, it can cause Explorer to freeze if it's on a network share. This seems to break the SMB connection, meaning any later file writes just fail to finish—they either get completely stuck or drop to near-zero speeds. When this occurs, a system reboot is required to restore normal operations.
Env: Win10 22H2, Kaspersky 21.25