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If the sound you are hearing could be described as sounding like a "sizzle", it is most likely arcing.
Arcing happens when electrical current has to jump a gap. The gap is a loose connection.
The corrective action is to turn off power to the affected outlet(s) at the fuse panel, then remove the outlet from the box. Make sure you don't disconnect any wires, to avoid potential confusion that could arise when reconnecting wires.
Once you get the device out of the box, you can inspect all connections. There should be connections of wires to the device, and there may be wires spliced to each other toward the middle or rear of the box. Check these splices if you find any, to make sure no wires are loose.