The same problem here.... all Win11 (24H2) after last update where new "design" of RDP bar comes, have a drops issues. Cca every minute our RDP connection is disconnected for 10 seconds.
It is on more PCs, with more different RDP connections (different servers). Ping is all right.
(also 3rd part application RDP have now the same symptons mRemoteNG )
It is getting us crazy.