I have a Sony Bravia KDL-43WE753, and recently when on Amazon Prime Video and scrolling through the Home Menu Screen the lag has become quite unbearable, about 15 seconds for each press of the button when scrolling up, down, left or right.  This only happens on the Home Menu. If I was to click on a TV series for instance, when the episodes come up on the screen there is no lag at all when scrolling through them. Just on the Home Menu.  I have done a reset, reboot, all to no avail.

I'm wondering if anybody else has come up against this problem, or maybe offer some solution.  Any thoughts/help would be appreciated.