I cam up with a fix to it, I simply deleted all the fridges and then put them back, the cooks started doing their thing again!

I still have it. It ended temporarily when I changed the food quantity from medium to high, but about a day later is started again. It seemed to trigger when I started work on a max sec wing and I put a kitchen down. After that, no food arrived. I even deleted the kitchen, restarted the game, still ...