2.4GHz is the same freq as microwave ovens, WiFi (802.11x) and Bluetooth. If it's intermittent and "HOLY SHIT WTF WAS THAT" loud, that's probably someone running a microwave nearby. You can test it with yours and see if it does the same thing.

There are basically two types of wireless headsets: standard broadcast RF and Bluetooth-based.
The standard RF ones are just basic "spew some signals and have the headset pick them up," sorta like FM radio. Normally, it is fine but it IS susceptible to RF interference degrading the quality of the audio.

Bluetooth is a "stateful" digital connection between the transmitter (which usually plugs into USB or your audio port) and the headset. Bluetooth also uses adaptive frequency hopping to identify which portions of the 2.4GHz set of channels are "clean" and only uses those most of the time. The downside is that if too many of the channels are dirty, you lose available digital bandwidth so your audio may begin breaking up/stuttering or stopping from time to time. Also, the Bluetooth headsets tend to have higher cost, lower battery life and shorter range as the cost of higher quality sound.
So, just have to decide which method you'd prefer. Personally, I prefer bluetooth over basic RF as I understand how to "debug" things if it acts up.