Baby splitting bottle feedings

My daughter is 10 weeks old and was on a pretty consistent schedule during the day of 5 oz bottles. All of the sudden, she is now stopping about halfway through and wants her pacifier (crying if I try to offer the bottle again instead). About a half hour to 45 minutes later she will want the rest of the bottle.

This has gone on for about 3 weeks. She is also eating less during her 1 nighttime feeding, and another small bottle when she wakes up. I have tried enticing her back to full feedings so we don't have a bunch of snacks all day, to no avail.

She has also had bigger burps lately, so maybe tummy troubles? We haven't changed our formula (Similac Pro Sensitive).

Anyone else experience this?