I had the same problem and i found a fix, just give NAT1 to your console or PC on your router.Had this problem all the time since i got the game 4 days ago, always got the delta error 20000988 every 10 minutos it was frustrating as hell losing the game servers in the middle of every mission and restarting from last checkpoint.Finally after some investigation i found a solution that works for me, i never got any error again after giving NAT type 1 to my PS4, its a problem with our router and not ubisoft servers!Here is the fix, just fallow the steps:- Log in to your router with admin codes, normal user codes wont work, u must access admin tools!- Local network - settings - activate the Bridge on port 4 - connect a ethernet cable on your ps4 and on slot 4 of your router, this will give NAT 1 to your ps4- restart router and ps4, then connect ps4 via LAN with automatic settings, u will get NAT1 and your ready to go, problem fixed.This steps can be different from router to router, just look up on your router guide how to give NAT1 to your ps4 or pc.