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jakemcree
@Skülly
Wheels may be flexing as you put side loads on it (getting out of the saddle and leaning the bike). Squeeze parallel pairs of spokes with your thumb and fingers. If your spokes feel at all loose you may need to rebuild. If not, your wheel may just be really flexy. Maybe time to invest in new stuff
The other possibilty is that the hub cones / bearings interface is loose, so the wheel spins well unridden but is shifting a bit on the axle under load.