I have the same problem... disconnects and reconnects me on chat CONSTANTLY,, constant host migrations... I end up doing sortie interceptions by myself halfway through the mission as when the host migration happens Im all of a sudden alone in the mission..
Railjack is a joke with this.. constant SUPER lag when trying to join a mission with the cross play group.. MULTIPLE host migrations.
Ive been playing steady for the last 3 years.. this has NEVER been this bad..
If it keeps up im going to find something else to do with my time..