I have been using this product since 10 July this year, and at the beginning it was running quite well, but after a certain time it hardly cooled at all. It goes from 28C room temperature down to 27C max. I have noticed that sometimes the "cool" mode is activated but only the fan moves. I have changed the mode several times but nothing has changed. I think maybe it's because there's hardly any coolant left or it has a problem with the technology in the body. Is this normal and if not, what can I do?