Broadband intermittent noise. Sounds like some kind of electrical interference to me.
I guess it depends on how much time you want to put into finding and correcting all the instances. I don't know Wavelab & I'm just figuring out my way around Samplitude. I suppose you could try to x-fade a eq reduced copy, try Wavelab's noise-reduction tools, or an external noise elimination plug-in tool.
I tried a couple quick things in Samp Master and the best was using the 'spectral cleaning' tool and selecting the noise visually on the FFT display. Not sure if there is something equivalent in Wavelab.