You’re likely allergic to coconut flour due to leaky gut and you don’t notice it at low quantities. This is the symptom you are likely experiencing…
If you were to try other flours such as buckwheat, rice flour, teff, etc. you likely won’t be allergic to it. If rice flour or rice bran is your only option because you are allergic to others, better than nothing imho.
Also if you rotated flours then the yeast won’t adapt to it.