Signa 4 Soundbar Desyncing from Sony TV

Hi, I've been experiencing this issue with my Signa 4 ever since receiving it and hooking it up to my Sony TV. Sometimes, I have no issues with the handshake maintaining my soundbar as the external audio source, but occasionally the TV will not maintain the connection and automatically switch back to the TV speakers. Even manually switching back to the soundbar source fails after a few seconds.

My TV model is a Sony XR-65X90CJ. I have the soundbar plugged into it via HDMI eArc. Yes, I have checked the cables multiple times, including the power cable, and all seem fine.

A while ago I called Polk customer service and they took me through some steps to troubleshoot this issue in the TV settings, but I cannot remember what those steps were. Any help would be appreciated.

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