latch issues

My son is about a month old. Overall breastfeeding is going really well. However, over the last few days he has been extra fussy and has trouble latching. He will latch but then comes on and off my breasts multiple times during the feeding. I think this is also making him gassy. It's strange because this hasn't been an issue since the beginning, just recently. I don't think it's a supply issue because he has plenty of wet and dirty diapers each day. Would love suggestions. Thanks!