[lubuntu] Lubuntu Sound stopps after playing some seconds or minutes

Hello

I am using a lenovo Thinkpad X201 Tablet and lubuntu 16.04. But these specifications seem not to be very interesting, because a) the problem was mentioned before:

https://ubuntuforums.org/showthread.php?t=2211531

and b) The problem also arises on a lenovo tower.

Problem description:
I can watch videos and listen to sounds, but after about 30 seconds to about 2 minutes the sound suddenly stops and is back only after a reboot.

sudo alsa reload

I guess it is either a) a software driver Problem for their cards that lenovo uses or b) a hardware protection as mentioned in the thread 2211531.

Any Ideas how to find such a bug?