Cool Mattress Pad - Single

Bought first mat in December mat was heating up after about 2 hours gel was liquid and felt like I was lying on a warm water mattress had to get out of my bed to remove pad in order to sleep. Phoned to advise of problems told that pad should remain cool all night so was told to return which i did just received the replacement used 1 night and is doing exactly the same the exact opposite of what I require it to do as suffering badly from night sweats might be ok if you were just using it for a short nap but doesn remain cool for more than about 2 hours so pretty much useless if requiring it for any more than that