Check the wire harness in the engine bay.
I've read about this topic in the european forum:
https://www.camaro2010.de/t26540f146...kabelbaum.html
There are some very rare cases with broken insulations of the wire harness in the engine bay. When it rains, the wires get wet and by this you have shortcuts and electrical disturbances.
For model year 2018 there were changes made on the engine bay wire harness.