recently I've updated from Kubuntu 14.04 to Kubuntu 18.04. Since then my external sound card (old creative ub sound blaster) 'cracks' and 'pops' almost randomly. During login to KDE it cracks like 5-10 times. When I play some music in Amarok and the last song ends it cracks. When I open some page with video it cracks again. Generally, the sound is working, but it's really bothering. It seems, like it's somehow put to 'sleep mode' when there is no source of sound and then awaken when the sound system is needed, but that's just my wild speculation. I've heard the same sound in 14.04 when I discunnected the card and connected it again. Anyone faced the same issue? Is there some settings that would prevent it?