The problem with the sound.

Guys, if someone faced a problem, help.
This situation. I bought a headset Kingston Hyper X Cloud , everything was fine, after I bought an external Creative sound Blaster X G5 and here the problems started.
The sound in the games at some time of inactivity (a few seconds). gets louder on the rise after a specific action (shooters - shot, running, just clicking on the menus which emit a clicking noise) dramatically fades all over again.
I've tried everything, been through all settings for sound, driver for 10 times changed, stupid piratical it in all the inputs, nothing helped, help me out.
Thanks in advance.