Vehicle Shudder problems of the 2015 GMC Acadia

It has been since I bought the vehicle . . . Gas gauge is intermittent and cross traffic alerts go off randomly (with no traffic or obstructions) paint has had to be redone leather replaced trim redone etc. . . The car almost killed me and my children, I'm driving down the freeway at 70mph and suddenly I lost control of the vehicle it slowed down to 49 then 25 lost steering and able to drift to the side before the whole vehicle started shaking violently and I shut it down as I believed it would explode (I was terrified) I called a dealer and they asked if I turned it off and on again ? engine light came on traction control would not renegade and message said decreasing power to engine while it was happening and abs light on . . . All failures. . . Managed to get to destination but vehicle was sluggish and jumping gears felt really jerky. . . 4th start all lights disappeared and although car was still sluggish figured might have been an electrical fault made appointment for dealership told it would cost . . . Parker car drove other vehicle then had to use this one and same thing happened again so took to dealership they couldn't figure out the codes was told had broken engine mount (said it was on backorder as it's been happening a lot) and was sent on my way to see if it would happen again. That weekend it happened again had figured out by then that 5-7 starts it would act up. Took to dealership and left running so they could see what was wrong (failed transmission, steering column block pump sensor etc replaced. Was given a rental GMC by herts and you guess it same thing on freeway all the lights on the dash start lighting up failed traction eas and breaks (super scary brand new only 600 miles on that car) switched out vehicle for a safer car (Toyota) I'm unable to check more boxes but speed and control were also affected.