Anyone else??

My LO is 6 weeks and she latches perfectly all day except the last 2 nights at 4am she will not latch and today it happened at 10am again. She latches On after a big fight, sucks once or twice then unlatches. She does this over and over again, so at 4 she did get a bit and fell back to sleep. I don’t understand why it’s happening I had to bottle feed her my milk at 10 because she wouldn’t latch after 20 minutes of trying. Has anyone else’s LO done this, is it a phase? Any tips??