I made a quick look at the Canon support site and saw no firmware update for the original G7X. I shot with the G7X Mark II for years and never had any focus issues. My current travel camera is the G5X Mark II, which has a little better lens. The only focusing issue I have had with it was in shooting some video. After it was turned back on, the autofocus would hunt around a bit, messing up the start of a clip. As long as I kept the camera on, it was not a problem. I don’t recall any focus issues with stills. One oddity was in churches in Italy, the face detection seemed always to hone in on the face of the Virgin Mary