I have not seen any of the symptoms you guys are describing. However after updating to 5.3,0.2 last night, I'm getting write errors randomly every 2 to 5 min, sometimes as long a 30min between errors....
Write Error 80000035, undefined (1181)
Oddly, no playback issues. I only notice them because I have push notifications turned in for any system errors. Else I would have no idea it's happening (other than checking log).
ETA:. The error number is changing slightly. I just had another and it's "undefined (1236)"...
False alarm on my part. Turns out I have the BI log file being saved to a NAS (the clips are being saved locally on an external USB HDD). The power supply for the NAS was failing and intermittently power-cycling the NAS. Started around 4A. PS replaced, and errors have stopped.