Hey ProToo, sorry to drag you back down this rabbit hole.
A simple experiment I do is play Norwich liverpool at village road night summer clear weather.
I originally created a third liverpool kit, the black one. And it immediately started glitching.
I deleted that kit, played with the default liverpool red kit and game played normal again.
So...I changed the colour, nothing else, on liverpool's home kit to a brighter red to make it closer to reality. And it glitched again!
I changed it back to default and it played fine again.
So this is what I've done only on my new save on the new ps4 slim.
On my old ps4, I changed a load of kits at once with a mass edit and had the same problems, so I couldn't isolate the problem then.
But now, with this new ps4, I've tried just one kit and it definitely caused the glitch.
The main thing is animation glitching. Players will warp, they will stutter, the ball will not move away from players properly when dribbling...it will almost be stuck close to their feet and then suddenly be kicked 3 or 4 yards away on the next touch fro no good reason. It's just a general degradation in gameplay and it's so noticeable.
Would be so good to hear what happens for you. I'm just beginning to think it cant just be me...