01:46:57.162: adding 23 milliseconds of audio buffering, total audio buffering is now 325 milliseconds (source: Mic/Aux)
02:01:41.649: adding 23 milliseconds of audio buffering, total audio buffering is now 348 milliseconds (source: Mic/Aux)
02:07:49.934: adding 162 milliseconds of audio buffering, total audio buffering is now 510 milliseconds (source: Desktop Audio)
02:30:12.826: Max audio buffering reached!
02:30:12.826: adding 534 milliseconds of audio buffering, total audio buffering is now 1044 milliseconds (source: Desktop Audio)
You're either overloading your CPU, or, if one or more of the above is a USB audio device, possibly overloading your USB controller.
09:19:49.289: Output 'simple_file_output': Number of lagged frames due to rendering lag/stalls: 310 (4.9%)
GPU overload.
https://obsproject.com/wiki/GPU-overload-issues
09:19:49.290: Video stopped, number of skipped frames due to encoding lag: 4250/6303 (67.4%)
Significant encoder lag. You are massively overloading your CPU.
If this wasn't happening before I would look and see if something else is using more CPU than previous. If you have logs from those sessions it may be helpful to look at those.