A "mate of a mate" , baby boomer grey nomad , bought a brand spankers top of the line Triton Turbo diesel ute to tow his new you beat caravan round Oz.
Started giving those kinda problems you mentioned in SA during the rip home to WA
He had quote "had it chipped" ( don't know which method !) , he took the "chip" off and fronted up at the Mitsubishi dealer pleading ignorance.
First plug up to the diagnostic he is asked ' Is / was this chipped ?" He says " what's that etc etc " feigning ignorance as you would.
Service manager says " it has been , and it was disconnected yesterday..." End result NO WARRANTY !
He limps home to WA towing his van , then once home immediately trades it in to the Mitsubishi dealer in Bunbury 250 K's south..
May be an urban myth of course , but it "sounded" legit.
My Navara is a 2012 so none of that worry for me ( warranty worry that is !)