Mixer receiving strange interference

[Spork829]

I've been using a Behringer Xenyx Q502 mixer so I can hear my guitar through the headphone output on my amp, as well as my PC, at the same time. It's worked great, however just today I've noticed some really strange static/interference going on. It's always had a little static when you turn a channel's volume all the way up, but I haven't needed to, so that's fine. However now I've noticed that on about half volume on the output, what I normally use, I'm hearing some strange things. It's mostly when I manipulate the mouse. Scrolling up and down causes a faint, low pitched static sound, while just moving the cursor creates a higher pitched, very fax machine-esque buzz. Then when I run a game, or anything GPU intensive, those two things are totally drowned out by constant, much louder static. This is a real problem because even at 100% windows volume, I can barely hear the game I'm trying to play with the mixer turned low enough not to hear the constant static.

 

Naturally I figured this was an issue with my motherboard's onboard sound, because it's related to things in or connected to my PC. However when I cut the mixer out of the equation and plugged my headphones straight into the PC, none of it's there, no matter how high I crank the volume.

 

So... what gives? Is the mixer just garbage (I've had it for like 2 months!), or is there something I can do to fix this?

[kasugatei]

3 hours ago, Spork829 said:

I've been using a Behringer Xenyx Q502

Since it is a Behringer mixer, I would say that it is a "feature".

[Spork829]

15 minutes ago, Niksa said:

Since it is a Behringer mixer, I would say that it is a "feature".

Are they that bad? Suppose I should have done more research before buying...

[kasugatei]

1 minute ago, Spork829 said:

Are they that bad? Suppose I should have done more research before buying...

They have some decent products, however, small form factor mixers are not one of them.

[Spork829]

5 minutes ago, Niksa said:

They have some decent products, however, small form factor mixers are not one of them.

Noted. Would you have any recommendations for a similar replacement?

[kasugatei]

44 minutes ago, Spork829 said:

Noted. Would you have any recommendations for a similar replacement?

Sorry, my experience with small mixers is quite limited (I can recommend you a nice 24ch + thou xD). What I've been told Yamaha ones should be good, but don't take my word on that, do some research first.