Disconnects from the internet after a period of time without surfing. The equipment is not suspended nor a hymn. Only X amount of time remains inactive. Time solution: disconnect from the network and reconnect.
This doesn't look like a problem in plasma-nm, I would suggest reporting this to NetworkManager instead [1]. [1] - https://bugzilla.gnome.org/page.cgi?id=browse.html&product=NetworkManager
Bulk transfer as requested in T17796