Switch [HELP] Multiplayer game won’t load

SMN23

Newcomer
My mother and I have been playing local multiplayer for 3 yrs in game with no issues. Today we tried to play and every time my mom would try to join game I host it kicks both of us out of the game. The host screen says software closed because an error occurred. Screen trying to join says one or more consoles are not responding and has an error code (2618-0502) I looked this code up and it’s related to internet. However, I created a new save and it loads fine and my mother can join no problem.
I have tried resetting router, resetting both consoles, my router has 5ghz and 2.4ghz signal and I have tried both.
I can play the save file on my own but not in co-op.
Online connection co-op does not work either.
Please advise on what I can do to fix this or is my save data corrupted. I have preformed the switch scan on the software and it says no corrupt data found.
 
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SMN23

Newcomer
Still needing help with this.
I can start a new game and it plays multiplayer just fine. But if I try to load this save file it crashes before 2nd player enters game.
 
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