Just purchased the a7iii back in November 2020 from B&H. All good until I started to pixel peep on some New years photos and the right hand corner showed a RED pixel for over a 100 pictures. Granted I had the camera ON so I could just blast out some photos when the action started, but I'm wondering if I should be concerned and send this unit back or in for inspection. I did some test shots with the lens cap on and it didn't show the dead pixel, but then it appeared again on some lunar shots in a different location in 2 spots! The sensor is clean and the lens is a Tamron APS-C 18-200. Any suggestions would be helpful.