Sony X85J Question...

[Mao]

Sorry if this is listed somewhere...

Just picked up this set for the holidays and new to 4K TVs.

I'm really digging this TV, but there are a couple things that are bugging me:

1) When streaming Hulu and a couple others, I notice a distinct "frame skip" every 10-15 seconds or so. It's so quick, but my eyes see it and it bugs me.

2) I was watching my first Blu-Ray on the display and noticed on both the Blu-Ray and watching regular 1080p content from networks that the screen tends to anticipate a dark scene coming next by a very fast dimming of the picture just before it gets there. Hope that makes sense. It always happens when going from a brighter scene to a darker scene.

I am in the process of upgrading my HDMI cables, but is there some other setting that I'm ignoring?

Thanks in advance for any words of wisdom from the enlightened!