what firmware are you on? this seems to be worse on v4 although I still had it in V3 so I disabled some processes using workaround in this post. some people have reported it settling down after a long time, mutiple days which veries greatly depending on number of media files
I am still not sure what you lose by disabling them, thumbnail pre-generation for the WD photo app is one but it appears to genaerate as needed without it. no idea what the other process does. I have not noticed anything missing
