Transmission Stuck In Gear problems of the 2015 Chevrolet Cruze

Car is in for service for 3rd time -- intermittent electrical problem causing loss of transmission (I. E. Revs then drops in and out of gear); driver display warnings include service stabilitrak, service power steering, service transmission. Power door locks also operate on their own. Instrument cluster gauges will drop towards their off position, then resume normal position during these events. If the car is shut off, sometimes a "no start" condition will occur when the key is turned to the start position, gauges will operate normal even with no start condition. After rapidly cycling the key off/on/start position for sometimes up to 30 times, car has always eventually started. Sometimes condition has cleared, other times transmission is stuck in a gear (3rd for previous dealership visit, 4th for current visit) but not in a limp home mode as full engine power is available. Manual shifting is not permitted, "shift denied" appearing on the driver display. Very concerned about safety as dealership cannot guarantee that transmission will not drop into lower gear at highway speeds. If the transmission were to suddenly drop into 3rd at 75 mph with no application of the brakes, the car behind me may not be able to react to the sudden drop in my vehicle's speed. Condition has happened when vehicle and components are hot, such as after highway/city driving for 2 hours.