Vu DUO running really slow

Hi my Vu Duo has been running very slowly, sometimes taking a few minutes just to change channels. It is always very slow to boot as well.

I've noticed that it only does this when I'm on 28.2- channels change at normal speed on Hot Bird and 19.2 strangely.

I bought the box second hand and it has done it ever since I got it. It's running on OpenPLI 3.0.

Any help on fixing this would be appreciated. Thanks

I'm a complete novice when it comes to this but is there a way to load a new image without having to reset everything else (the cams etc)?

Don't know what a swap file is I'm afraid, so no I don't have one lol