I'll respond here just to share my thoughts, but first a caution: I typically find trying to help those who ignore BIG RED letter warnings to be more frustration than its worth
- so if you insist on ignoring the big red warning about NOT recording to MP4 (there is usually isn't a good reason to be doing that), I'll probably not respond further. Though your issue isn't an area of expertise for me, so probably not a big lose to you. Note: that your video editor can't use MKV is NOT a reason to record to MP4, that is what remuxing is for (which takes ~20 seconds on my PC for a 12GB MKV)
That is a 4 generation old Ultra low power CPU, optimized for battery life, not the computationally demanding task of real-time video encoding. So, maybe a system overload and/or thermal throttling issue?
Is Win10 Game DVR =On for a reason?
You log is too brief to see any performance stats.
I recommend monitoring hardware resource (CPU, GPU, RAM, Disk I/O, etc) utilization [for ex. using Task manager’s Performance tab and/or Resource Monitor] to see if your system is being maxed out with your settings. Also, you may want to research the specifics of your laptop's make and model regarding CPU/GPU/VRM temp monitoring and thermal throttling behavior and mitigation measures
Are you using the exact same mic? or maybe the built-in mic on the laptop is the problem?
Or maybe a USB Root Hub overload scenario on the laptop?
Have you considered installing the CoreAAC audio encoder?