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Ok, I am an electronics engineer. I KNOW what the problem is. Dissimilar metals and or corrosion.
Al wire is now banned in most housing applications. Why? Because the connections degrade and can actually heat up to the point where they can cause a fire.
What you can do about it? If the installation isn't to old, sue the builder and make them fix it. Probably no longer an option.
Remove and regrease the connections with the connecting compound for Al wire and retighten them. What you are seeing is the total loss of connectivity in each connection. The IR drop across this connection can cause a fire due to the heat generated by the lousy connection. Some people use a copper to Al wire splice to "fix" this problem at each switch. Don't do it, it will only fail again and is even MORE likely to cause a fire than the first faulty connection.
The ONLY certain and safe way to remedy this problem is to REPLACE the Al wire with copper wire. Could get very expensive, but I know of no other certain way.
You can just retighten all your connections and get your service back, but you are risking burning down your house.
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