I havent had this issue however there have been a few small bugs.
One of the issues is every now and then the electronic viewfinder seems to lag and become jerky. The live view remains ok. Turn off and on usually stops it but it would result in a missed shot if shooting action.
Another issue I have every now and again is the focus point square dissapears from live view so you cannot see where you are focussing. Again turn off and on.
I also had an issue where I tried to turn the camera off, but it didnt turn off. Had to take the battery out. This only happened once and was when I accidentally started a long exposure so tried to stop it early.
Feels like it needs a firmware update to fix some minor bugs.
EDIT: I have emailed the issues I have had to Fuji UK technical queries contact. Might be worth letting them know so they can look at the right firmware updates.
fujifilmtec_uk@fujifilm.com