Fussing

[L2310]

My LO has started fussing on the boob and getting really frustrated and I have no clue why! She's fine at first and has a 5/10 min feed straight from waking then falls asleep so I wind her which wakes her up so she starts wanting more and its then when I try to get her back on for more she has the nipple in her mouth but won't clamp down and throws her head back and cries out of frustration! She doesn't do it all the time its mainly evenings or through the night. I had thought maybe she was just wanting the nipple as comfort so tried her with a dummy but no joy - she sucks a few times then cries and spits it out. I've tried cuddling her in and giving her my little finger to calm her but as soon as I try again it happens again. Seen health visitor this morning who checked for tongue tie and oral thrush but both fine so its not that. The only other thing she suggested was wind or maybe a bit of colic which I didn't think it could be as I try to get it up first, so I have just been and got some Infacol to try and see if that helps. Has anyone else had this and worked out what it was? I've got plenty milk so can't be because of short supply and I also try switching boobs which does nothing. Shes also putting plenty weight on - she has put on 1lb 2oz since she was born 3 weeks ago xx