coop problems

It has been solved. Had to abandon all Lodi quests and now its fine again. I saw other player had the same issue and fix on discord, so it may help others if they searching for answer here. I picked up all the quests, like i always do, after the last Lodi quest fix my coop stopped working...

Im using Google translate to write this... When im playing coop with a random person the game runs perfectly, no lag or desyncro problems, but when Im playing with my friend, it is imposible to play because the game runs very slow, with a lot of lag and desyncro problems, we live close one to...