auto transmission. transmission probelm

Hi everyone, I am relatively new to Navara ownership as I needed a workhorse! So far I am quite happy with mine, even though it's battered, but it's fulfilling it's purpose! After moderate/heavy breaking, it takes a few seconds for the gearbox to go into the right gear, if you accelerate hard...

I have a 2017 navara. today pulling up to a job “bumped” the kerb. finished up, back in the car, starts fine but doesn’t have enough power to get going. In numeral it will rev its guts out. In drive it will get to 1000 and that’s it. Is there a “safe mode” or something I may have bumped loose...