2017 CHEVROLET EXPRESS Engine Problems

WE'VE HAD 4 INSTANCES OF "ENGINE POWER REDUCED" AND CHECK ENGINE LIGHT, WITH NO PRIOR WARNING OF ISSUE ON THE DASH DISPLAY. I BELIEVE THIS IS DUE TO AN ISSUE WITH THE DIESEL PARTICULATE FILTER SOOT LOAD TRACKING. THE FIRST 3 OCCURRED ON RURAL HIGHWAY AND THE 4TH ON A LOCAL HIGHWAY AT SPEED. THE POWER REDUCTION IS IMMEDIATE AND SEVERE ENOUGH THAT THE VEHICLE RAPIDLY LOSES SPEED AND CANNOT KEEP UP WITH TRAFFIC. HAD TRAFFIC BEEN CLOSE OR WITH A TRAILER, THERE WOULD BE RISK OF BEING REAR ENDED DUE TO THE SUDDEN LOSS OF SPEED. I FEEL THERE SHOULD BE SOME WARNING TO GIVE A FEW SECONDS EVEN TO PUT ON HAZARDS AND PREPARE. THE LAST TWO EVENTS HAD CODE: P2463, THE DEALER RAN A SERVICE REGEN, BUT NO FAULT WAS FOUND. ON THE LAST ONE, THE DEALER GAVE ME GM SERVICE BULLETIN #10-06-05-002G STATING THE GM WOULD...