My setup is as follows:\n\n—Denon AVR-X4700H AV Receiver\n—LG 4K OLED 77C1 77-inch Television (OLED77C1PUB)\n—Panasonic DP-UB9000 Ultra HD 4K Blu-Ray Player\n—Roku Ultra HDR 4K UHD Streaming Media Player (2020 Edition)\n—5.1 Surround speaker system\n\nRight out of the box, I noticed that my Roku Ultra does not consistently recognize that I have a 4K television and setup. In fact, more often than not, it’s convinced my system is no better than 1080p. As a result, it streams content in 1080p.\n\nThe Roku is erratic when it checks to verify my connected TV is a 4K device. Sometimes it guesses correctly; other times, it guesses wrong. On the occasions that it does recognize my 4K system, the stream, especially while running Netflix, becomes spotty, blacking-out, flashing white or displaying an error message that states 4K is not available. I’m planning to replace the HDMI cables that connect the Roku to my receiver. Don’t know if that will solve the issue.\n\nWhat else could be causing this problem?