Services all say that i need to upgrade, but i still have capacity

I am having exact same problem.

I was trying to reduce population to see if it can affect cargo shipment fulfill amount, so I disconnect power/sewage/garbage collection from road down to zero. To my surprise, the happiness down to 8%, but population only drop by 1/5. Sims seems don't want to leave a town with no services.

And I didn't find cargo shipment has less requirement amount, then I connected all utilities back to road, but wow, although my power are more than double of required, residential still shows no  power at all, I even tried bulldoze power plants to make it below needed, than build them again, no success. Both residential and utility icon shows warning say that I have no power despite I have 122/49 excessive power. So did sewage and garbage are showing red even they were indeed enough. I have been waiting overnight, still, no helps, abandoned house keep abandoned, happiness never came back, so neither the tax income