TPMS Issues

[Redman61]

I have recently purchased a 2015 Chevy Roadtrek 210 Popular that was mostly well cared for, the one ongoing issue I am having trouble fixing is the rear wheel TPMS sensors dropping out on the DIC panel. I have had two sets of New sensors installed with the last set being both front and rear supplied by a GM shop and installed at a GM shop. My first trip up a highway after about 15-20 miles I lose the readings for the right and then the left rear tires and get a warning to check my tire pressures. I do stop and check them with a manual gauge and all appears in the normal range. I let the van sit overnight and the next day the sensors appear on the DIC again. Again, after a short travel I lose the right then the left side, anyone ever experience this and more importantly is there a fix?