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Don't cut drywall, not yet and I don't think it necessary. Yep, somewhere there's a loose connection. Open your switch plates and pull the switches out starting from the bad switches and work upstream. No need for anything fancy, just a simple tester will do (I really don't think you need it). Don't ground the tester to the grounding screw, touch the hot and neutral. I bet you the lazy electrician didn't twist the wires together and did not tighten up a wire nut well. Also, tighten all neutral screws that are connected to all switches.
It could be that your wire was cut during installation when the house was built, but its highly unlikely.
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