I've had a Ventus W155 for the last year which has been fine for my needs, however, just this last week or two its giving inaccurate readings (too high). In the car the last week I noticed that the car thermometer was reading minus 2 at one stage, and the Ventus was reading 2 or 3. At the moment its 22:31 in South Wales and its reading 15.3 which can't be right... The temp sensor is situated on top of the TV mast as its always been, angle a god foot from the edge of the roof. Its been fine until the last 7 days or so. Any ideas? I know that when in direct sunlight the temp can read too high, but this is 22:30 and its dark.