Actually had my brand new F45 replaced today because the screen lagged when you switch to menu/activities etc. The bottom third of the current screen would remain for 1-2 seconds before switching over to the newly selected screen, as if there’s pressure being placed on the screen. Got the new one, everything worked fine, no lag as it were. Behold the update to the latest software, and the problem is back. This is very disappointing on a brand new product.