In June 2019 I purchased a KD-XG9005 with extended warranty. In October 2019 the tv developed a fault (what appeared to be small bits of debris behind the screen front). This was exchanged but in October 2020 the second tv developed the same fault. Sony replaced this with a KD-49XH9505. This produces a great picture but I am now super critical. With solid backgrounds the corners are dark (I believe worse than the previous tv). The photo shows the XH9505 with a solid grey picture. It’s not normally noticeable but is distracting to me. Sony claim that this is normal and not a manufacturing defect. Am I being over critical?