I'm not sure if I read it here or on a Facebook group but there was a discussion about the solenoid in the PP PDM box failing slowly.  The symptoms are that the devices on the planter are not recognized when powering on but after several attempts the system will power up and work fine.  I have had this happen to me half a dozen times this spring.  Is the solenoid a part I can get at the local auto parts store and easily change?