Baby will prefer bottle feeding is because the flow is instant and continuous. The baby is required to work very little. Once a baby has had a bottle, especially a lot of bottles, she may begin to prefer the ease of bottle-feeding over the work of breastfeeding. She may become frustrated at the breast after the first let-down occurs and the flow of milk begins to slow.
You can try by pumping out your milk first and then latch so that the milk flow is established or It can be helpful to do some breast compression when this fussiness starts.This will help speed up the milk flow again. Once compression stops helping, try switching baby to the other side when she begins to fuss and back and forth again.
Also you can try to breastfeed in a quiet and dim environment or when baby is in sleepy state before naps, this way you can also have a good time bonding with the baby.
Another reason could be also that your 6 months old baby is teething and that the sucking motion of nursing would have caused discomfort or pain on his gums.
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