In Splatoon, you can't even go into the Switch's main menu without automatically disconnecting from matchmaking 1/2 times. I guess that might be something to do with hardware(I really doubt it), but just matchmaking in Splatoon is crap.
Sorry I will delete Splatoon reference. Main times I played it on Wii U was with 90% Japanese players so didn't suffer much lag. I'm here to respond to to shitty Smash online play.