When you feed it, add about a Tbsp ofRye flour yo the regular flour. Adds sourness. The yeasty beasties must metabolize the a little differently than wheat.
That one got fired up with some whole wheat after getting it out of the fridge.
I'll try the rye flour next time maybe.
No doubt, there's some different chemistry going on. Usually I just restart it with all purpose, take what I need out for the bread and mix the other flours in with that. Buckwheat works wonders for flavor too. Oat flour also.
Might have to give some potato flour a try someday. Might remind me of vodka though