Soft Bright Spot at centre of images?

runningman

Hi. I have recently noticed a soft bright spot at the center of my images. It does not appear to be dust- which is present also! It is more evident in skies and is a noticeable bright spot. It cant be dust as the visible dust becomes sharper with small apertures and this doesn't. It is right in the center. I have not cleaned the sensor but have looked and there doesn't appear to be anything there. I am reluctant to clean the sensor in case this affects my warranty as the camera is only about 6 month old. Has anyone any idea what this might be. I am concerned it might be a defective sensor.
Thanks
I would add that it is evident when the lens is changed as well.

Ironheart

Pictures please. Is it a single bright pixel or is it larger?

Msmoto

As asked for, we need to see an image, including all the Exif data. If you are shooting long exposures, cover the viewfinder eyepiece.