Where abouts do you keep your hair straightener? As it may be because its cold or has condensation inside it. This may sound funny but you actually shouldnt keep your GHD in the bathroom cause they can get cold and dont like it, or if u want to keep it in the bathroom then wrap it in a towel. This may fix the problem. If not then call GHD and you may be able to get a replacement. Hope this helps :)
For me, the first and still very best of all ceramic stylers [and my dad is a hairdresser too]. It heats up fast, cools down relatively fast, works wonderfully and lasts a long time. In 11 years, I've bought two such stylers. The first one eventually died after 6 years of daily use, rarely skipping a day, while my second one is still going strong. I have no reason to recommend any other styler but this one. My hair is long and very fine.