Exporting Issues

Hello all. I have LR 4.3 (not classic) Something has happened witin the last month and I am not sure why and what.  When I export my photos from LR to save onto my desktop the photos are coming out grainy & I can see pixels which shouldn't be BC I shoot in RAW & all my photos are around 30+ MBs. Before I export it gives you a preview that is when I notice the grainy and pixels but when I cancel and go back to LR it returns to normal and I don't see the pixels. Also the same photos in LR Mobile are ok to export with no issue.  I'm thinking my export settings got screwed up. I reached out to tech support and this guy did nothing for 40min.  I really think he was watching a movie. lol I have Win10 & again last month was no issue.

I select all, share, custum settings, 

Dimensions -Full Size

Quality 100%

Includes Watermark

More Options - All Metada

File Naming Original

Output Sharpening - Matte Paper

Color Space sRGB