stuttering blu-ray

A Blu Ray can be as high as 40Mb/s but that should be well within your 1000Mbit link.
First, double check that your ports are actually going to 1Gb/s. Not familiar with your models but you'll find the info somewhere.

Then, transfer an ISO file to your main, fastest HDD (possibly an SSD) and see how much time it takes. See what Windows says as well. You should get a good idea of transfer time.

Finally you can try the NAS performance tester downloadable here

You should get a good idea of what's going on.

Nas is connected at 1Gb, just checked, light on router verifies
Same on media player, router sees 1GB connection.
Here is link to router and switch
http://www.linksys.com/us/p/P-WRT1900AC/
http://www.linksys.com/us/p/P-SE4008/?georedirect=1

Windows shows 26-52MB/s iso transfer from nas to laptop(ssd), 48GB iso

Nastester, 8000MB filesize
Running warmup...
Running a 8000MB file write on \\READYNAS\3D_Movies once...
-----------------------------
Average (W): 56.09 MB/sec
-----------------------------
Running a 8000MB file read on \\READYNAS\3D_Movies once...
-----------------------------
Average (R): 73.92 MB/sec
-----------------------------

Well, it's beyond what's needed for the average BD.

What do you mean exactly with "stutters"? Does the picture freezes for a second or do you see stuttering during a panning?

audio will skip, sometime video pauses.
I got new media player and while its an upgrade over previous units, wd live and ac ryan mini hd(these would stutter so bad that my avr(network receiver, yamaha) would drop audio frames and the encoder would flash from dts to off/or pro-logic)(jerky video) I still get some dropped audio but not to point where its affecting avr.

Interstellar, on the rocket launch scene was absolutely horrible, so bad I bought a blu-ray burner to get me thru the rough times.

media player set to 1080p 60hz and 24p enabled. tv is visio m551d 240Hz

Are you 100% sure it's a network problem? What happens if you play the ISO's from your PC?

you want me to put iso on laptop and play from there?

No, I meant play the ISO you have on your RN from your computer. I understand you're using a network receiver?

Was that happening before?

receiver only handles audio, has hdmi pass through, give me a moment while i figure out how to play blu-ray iso on my pc.

flawless payback on pc, I mounted disc image with power iso and playing with vlc media player

Good. Then there is nothing wrong with the network or the ReadyNas - unless it's a weird issue. It may be that VLC is buffering and the media player is not and some minor network issue is causing the stuttering?

Must be something with the Media Player then. I don't know that player, has it worked in the past? Did you do anything before it stopped working fine?
It may be a question for the media player's community though...