Got dh a professional weather station gizmo a month or so ago and its been performing ok we thought - day before yesterday when it was really windy the spinny thing was spinngin at some speed but it was only reading 10-11 mph and now its spinning quite fast blustery and its reading 6 - this isnt right is it? We took it back to maplins and its much the same? Are we doing something cock obviously wrong?