Light at the top of the stairs on the 2nd floor was strobing. I tested power at light and in switch and found that voltage was correct. Issue was that the LED bulb was bad. We installed new customer supplied bulb in fixture an dit worked properly. while on site customer stated she had issues with microwave shutting off randomly, i found that the outlet was broken and had loose connections due to the device breaking. I installed a new device and spliced pigtails on the wires.