2019 Tacoma noise in front end

I have a nice 2019 Tacoma 4x4 with 69,000 miles I've owned about a year and I noticed about 3 times when I take off from a dead stop I notice a kind of grinding / slipping noise when I'm going up a slight grade, so when this happens I back up and start over again without stopping and it doesn't make the noise. What can this be, and this is the only time it's ever happened. Also the black rubber strip on the roof of the truck is loose, is this supposed to be glued down from the factory or what? What kind of glue do I need to fix this problem?