That is because of the way your connection is being dropped/what your router is doing. It’s sending reset messages back to your client telling it your connection is dead, instead of trying to resend your packets - which then succeed when the connection is back up.
That's a possibility in theory; I haven't root-caused this to know what's happening in every case (again: not every drop is the same). Regardless, I'm just talking about what the average end-user might see; I don't really care where the blame goes.
