On 19/12/2018 06.35, Ralf Mardorf wrote:
  The issue could be related to the load and real-time
priorities when
 recording audio.  
Not when just using PulseAudio or ALSA. There is enough buffering
happening that no frame should be dropped due to process preemption.
real-time stuff matters when using Jack configured for low-enough latency.
Jacek