Zero Turn Mowers

Recently purchased an MZ54, since almost day one it has had intermittent starting issues. Turn the key and absolutely nothing. The dealership has changed out the key switch, all safety switches and the starter solenoid. Always happens after the mower has been shutoff from running, sometimes if it sets for 5-10 min it will start, sometimes it may have to set 2-3 hours. Have 12 volts going to the solenoid when the key is in start position. Can jump across the solenoid and the mower will start. Any help or recommendations would be appreciated!