Skybox f5 Subtitles fix

[skyboxf5user]

On some channels the subtitles are fine but on most channels the subtitles flash for less than a second meaning there isnt enough time to read it.
Is there a fix for this.. I checked and when i click subtitles again on the remote the first subtitle is fine but the ones after it flash on the screen

[ontherack]

only thing I can think of is reflash another firmare, do a backup first.