'ABS' 'TRACTION' and 'BRAKE' Lights on Intermittently

Like the title says, these lights come on simultaneously for a minute or so while driving and then go off.

Brakes and rotors have all been serviced recently (this was happening before they were serviced), any ideas?

I scheduled an appointment with the dealer to check, hate doing that. Hoping someone here may know what the problem could be.

Thanks