VDSL - KPN box 12 - Win11. The file uploading reserves the complete bandwidth, until not finished. Time out, server not found, network disconnected - various error messages received. All other devices have the same during net browsing until the upload is finished. It started 2 weeks ago...possible that WPA3 was enabled by KPN. I tried several options and the same. 

Before the issue, I have never had a problem with the same device.