My Western Digital My Book 500GB ext HD works fine for a short while. I monitor my HD's with Hard Disk Sentinel and as soon as I connect the WD to my computer it says 31 degrees Celsius. But within 10 minutes it is 40 degrees and Windows can't recognize the HD anymore. I let it cool off for a day and I can use it again for max. 10 minutes. Is there anything I can do about that or is it dying? In the beginning I used it in a warm environment (I live in the Caribbean), but now my room is constantly airconditioned.