my bb is coming to 5 months. these few days when I feed her, she will drink, scream, then continue to drink then repeat for half the bottle and then quietly finish.

Maybe she's just tired? My cousin's baby would cry in between her bottle feeds but still finished the bottle anyway. After that, she'll promptly fall asleep. It baffles all of us why this is happening. But her mother adjusted her feeding times slightly and the crying gradually stopped. But I reckon as long as baby is feeding well, there isn't much to worry about.

Could it be due to the wrong teat being used? Flow too fast/slow?

Is she teething?