Similar to Andy I'm having a problem with OTA recordings - video weirdly stuttering. I'm not sure when it started, seems like its been at least a few weeks, but less than a month? Hard to remember.
For me it happens on my Hisense TV (Google built-in) connected to a Soundbar (eARC), but NOT with my Shield TV Pro connected to an AVR (Audio and Video passes through the AVR). The apps are the same versions with the same settings. Speed to the server is excellent, and I'm playing the exact same recording on both.
When AC3 passthrough is on, the stats say "raw_ac3 (raw audio pass-through decoder)" and "Format: raw-ac3". In this mode, the video stutters. When I turn AC3 passthrough off, it says "ac3 (ATSC A/52A (AC-3)" and "Format: floatp". In this mode, the video does not stutter.