Same problem here,
I bought a PTV3000 and it 'sort of' worked with my Samsung Note III, (choppy sound and some multi-color pixeled noise which was not part of the image). Then I've focused on make my notebook work, which if finally did after upgrading the Video card driver, WiFi driver and WiDi software. In the process I updated the firware for PTV3000 to the latest version 2.4.38.
When I went back to my Galaxy, it didn't work at all. It connects, PTV stays in "connecting to wireless display device..." and the phone says "connected". after 30-40 sec. the Phone display "Screen Mirroring has been tuned off".
Tested with older firmare versions: 2.4.26, 2.4.19, 2.4.3, 2.2.16 getting the same results.
Unfortunately I didn't take note of what was the original firmware version out of the box.
Went back to the latest 2.4.38 and performed a factory reset. Same issue.
Installed the Samsung screen mirroring patch from play store -> same issue, It seems to fail faster.
So I'm stuck now in this situation.
Please post any update!
thank you!