Power Steering Fluid Jumping Around in Reservoir

EazyD

Hi all, noticing something I thought was weird with my power steering fluid in the reservoir. Please read and watch below; I could use whatever help you can offer. Thanks!

Observations:

1. Fluid moves around inside the reservoir
2. I don't see actual bubbles, but the surface jumps around like there is.
3. On a cold start, fluid is just stationary
4. After driving to work, it is shaking around
5. When you shut the car off, the fluid stops moving.
6. Reservoir is very hot where the fluid is.
7. Correct amount of fluid is in there
8. It's stock fluid
9. The video below is after an autocross run (61 seconds of hard turning), but like I mentioned above, it also does this after a casual commute to work.

I could use suggestions, probable causes, confirmation that it's not just me, and any other comments about this. It's freaking me out.

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Pearl White 2010 370Z Sport, Stillen CBE, tint, K&N drop-in filters, GT-R start button, Kenwood DNX-6980 with backup cam, LED bulbs, Raceseng shift knob.