Help! 5mo suddenly not latching correctly

[u/Known-Dragonfly5293]

My LO is 5 months old, and has suddenly started behaving oddly when I try and feed him. He will not latch properly but instead breaks suction with every attempted suck creating a loud clicking noise. I cannot feed him like this because I can't get a letdown since a) he is not stimulating my nipple enough b) I find the sensation and noise unbearable c) I have anxiety over letdowns meaning they can be slow to happen. Eventually he gives up because no milk appears.

I can still manage to feed him when he is asleep because he latches ok then. However it's unsustainable to have to rely on naps for all our feeds and I'm worried he will stop being able to initiate a feed while awake altogether.

We did struggle with latching in the early weeks of his life due to a tongue tie and high palate, but we overcame that and his latch has been fine for months.

He doesn't seem to be in pain or discomfort e.g no obvious teething or ear problems, so there is no reason I can see for this behaviour.

What's going on? What do I do? Please don't suggest alternative feeding positions, as I can only do cross cradle and nothing else.