Xbox lag during split screen

Since the update on the 23rd the game is lagging HARD.
I only ever play split screen with my wife and it used to be a big issue during the menu lag, but now it is lagging All. The. Time.

Playing the bounty of blood DLC and tried to enter a new area on the map, the game lagged so hard when enemies appeared that I was suddenly downed, my wife suddenly had her vehicle blow up and then we both died!

Not fun, quite annoying, considering I paid like £80 for this on release day and it has had issues since day 1.

Please help!!!

I have tried doing the hard turn off on the Xbox, not sure what else to do?

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