Battery Cable problems of the 2010 Chevrolet Tahoe

Tahoe slams back into 2nd gear, gauges drop to zero and can only go about 5mph. The traction control and abs light comes on and the radio turns on and off by its self also the lock will go up and down. This happens out of the blue 3 times going highway speeds. The speedometer will go up and down as well. If I slow down to pull over and try to pick up speed to get over th gas petal seems to not respond. I've been fighting this issue since may of 2018 and it has been in the shop off and on many many times and is currently in the shop for the same thing. . I've already replaced battery cables, tried a battery, new fuse box, new bcm also found service bulletins that states the exact problem to the t and nothing works! you can go online and find hundreds of people that had the sales issue. But nothing seems to fix it. I have versions of it messing up because other people thought I was crazy that it had this issue and then I show them and they are like wow that is crazy!.