2013 Dodge Ram 1500 - Pops out of gear

when i am in 4 low going down a steep grade it will pop out of 4 low and its like i am in neutral. i have to hit brakes and if it is icy or snow i have big issues . it should stay in 4 low and should crawl

It sounds like the linkage might need to be adjusted. It may not be going fully into 4 low. And FWIW, 4wd won’t necessarily help on ice.