Have you updated your KD-43X8309C? Let me know in the comments if you noticed a change in input lag or USB tuner performance.
Updating your SONY KD-43X8309C firmware can bring numerous benefits, including: Firmware Change Update on SONY KD-43X8309C
: If an update is found, follow the on-screen prompts to download and install it. Have you updated your KD-43X8309C
: To avoid manual checks in the future, ensure Automatic software download is set to On in this same menu. Method 2: Manual Update via USB Firmware Change Update on SONY KD-43X8309C