Differential ADC has stopped working
Ferrite beads are decent inductors at low frequencies. You have a FB in series with the power feed to your ADC. On the power pins of the ADC you have a 100 nF capacitor. Now, if the input power were raised very quickly (or shorted out i.e. fell very quickly) you'd create a substantial overshoot on the power pins that might easily damage your ADC. Maybe something like this: -



For a step input of 1V the output may "ring" considerably and can quite often reach peaks that are 2x the supply voltage.

I'm not saying it definitely is this but I'd be concerned.