reverse light flashes and the truck won't move
 

Some times on my 2016 Ram 1500 when I put it in reverse the light just flashes and the truck is like in neutral. A message comes up saying to put it in park and then to the desired gear. After about 20 times doing this it goes in reverse. If I go to drive it engages. What is going on?

Since that's all software controlled behind the scenes, your best bet is to get the diagnostic codes read out to help determine where to start the troubleshooting. It could be an issue with the rotary gear selector, an issue with the transmission control module, or possible a bit of software corruption. If you still have a remaining factory warranty this may be covered by warranty. If you do not have a remaining warranty that would cover the related systems, or a scan tool that can access the transmission module, then you may want to try disconnecting the battery for about 10 minutes and reconnect to see if a mild reset gets things functioning properly again.

-Rod