I am a long time Canon user (current main camera is Eos 5D mk3) and after hearing/reading rave reviews of Fujifilm X-T3 bought this camera along with the 16-80mm zoom lens. I am having awful problems with the auto focus both for candid portrait type of picture and also recently tried taking action photos at our granddaughters local park run. I have tried all sorts of settings and the hit rate for properly sharp photos is really low. So disappointed with this camera at the moment and even considering selling it. I was relying on face detection for the portraits and results are mostly rubbish. What can I be doing wrong?