Help with Action Replay 4mb+

My action replay 4mb+ has lost its 4mb ram feature. It doesn't load any capcom or snk game, no matter they are originals or cdrs.

Strangely, the other features of the cart still work (save memory, import loads and gameshark codes).

My other carts still work (st-key, sega backup cart and a action replay clone-without 4mb).

I have no clue about what can be wrong, so I'm open to any suggestion.
Your problem might be that it could be an older action replay, since it still loads games (wich shows its still working).

Take a look at this.
Not any idea at all...?