I had the exact same problem, it cut out at 35 minutes, while using the machine. So, power management is not the issue. Windows 10.
I actually need to be able to record a voice constantly for 60 plus hours, in a variable bit rate. ( THen, I will need to use a command line mp3 splitter and a tag.exe.)
I am seeing a 0b mp3 file, while recording to the vbr. I speculate, I will need to double my file size and half the free space on my playback phone, because the vrb recording is not handled competently by soundtap. But, I am still testing and trying a second time.
I am posting here, hoping that the op remembers the work around, or if this is a fluke.