Same issues here mate i just got off the phone with them, they said their could be delay repairing the switch as they have many to repair it could take 2-3 weeks...
Its my 3rds switch... can't seems to buy one without issues very unlike nintendo
i just phoned them saying i was having problems in splatoon 2, connection always dropping and only showing one bar on wifi, plus problems with joy cons.
He said you need to send both items in for repair will take around 7 days, got shipment label by email, will pop into post office