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Why does my keyboard press keys (seemingly) at random?

I've recently bought a XTRIKE WINDDRAGON ME MK-901 KIT (wireless keyboard and mouse). It had worked perfectly for a while but recently these "phantom key presses" started happening. The keyboard and mouse work fine except when I'm gaming.
One thing I should note is that both the keyboard and mouse work on the same reciever.

Description of the problem :
While I'm playing games, the keyboard presses and holds down (random) keys. For example, I'm playing an FPS and it just randomly starts reloading, switches weapons, starts walking in a random direction (it walks until I press and release the key myself, then it stops), even as far as opening up the menu (Escape), taking screeenshots (F5) and opening lightshot (PrintScreen). Also, sometimes (rarer than keyboard inputs) the mouse stops working or even (very rarely) presses LMB.

I haven't had these problems before on my wired keyboard.
I am using Windows 7 x64.
I scan my system for viruses (Kaspersky) and malware (Malwarebytes) regularly.

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All Answers

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First thing to try.

In reply to: Why does my keyboard press keys (seemingly) at random?

Are new batteries in mouse and keyboard.

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Already tried it

In reply to: First thing to try.

Yes, I've tried changing them but the problem still persists.

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Then you have to swap it out.

In reply to: Already tried it

If the wired works that points to some failure in the wireless unit.

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Hardware problem?

In reply to: Then you have to swap it out.

So it's a hardware problem then and I'll have to buy a new keyboard and mouse?

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Or use the product warranty.

In reply to: Hardware problem?

The reason we test with another keyboard is to see if it's software. In this case it looks like hardware. Since most things have a warranty we try use that when possible.

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Software test

In reply to: Or use the product warranty.

I'm going to try to test my software first by connecting a wired keyboard and mouse. If the problem goes away then I'll be sure to use the warranty.

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