Hello, I've been having problems with my external speakers which are plugged into the back of my computer. My headphones work fine when plugged into the front of the computer but if i unplug them and use my external speakers, after about 10 seconds, the speakers will go out for about 2 - 3 seconds and then come back and work fine for about another 45 - 90 seconds. I know its not the speakers because I've used them with multiple different computers and electronics. I think the problem is with my sound card and being able to listen to stuff from the back of my computer. If it helps I have a Realtek ALC887 sound card and a gigabyte ga-z170-hd3p motherboard. Thanks.