Well, in the scheme of things, Amazon DOES CARE VERY MUCH about public opinion of their products...
Here's a group suggestion for EVERYONE having this problem:
I logged into my Amazon account and posted a "ONE STAR REVIEW" with details about how the new 4K FireTV does not work with the premium OTA Streaming DVD App (Tablo).
WITHIN 1 HOUR I had an UNSOLICITED email from an Amazon support specialist who said they tried to contact me at my phone number on file about wanting to resolve my problem. I have since emailed them back and waiting for a response...
Note that I tried a similar tactic with a different problem regarding their ECHO SHOW and through a similar process was talking to product specialist on the phone within 24 hrs (they called ME)! Although the user community provided a workaround for the issue I was reporting, Amazon had the issue resolved within a couple of weeks with a firmware update.
Amazon is getting some bad reviews about their new 4K FireTV so they may be particularly sensitive to these types of disclosures. ...and if its a real objective problem (like we have) then they may be particularly anxious to resolve something which can be demonstrated to be fixed (unlike unquantifiable claims of "slowness", etc). I expect they are pretty hungry for a few wins right now for the new 4K FireTV.
Out them in public with a one star review which clearly states that their new device has easily viewable problems that their older device(s) didn't. Publicly state that even cheaper generic media streamers don't seem to have these issues. Let them and their customer base know that the Tablo device is the best/largest/most capable OTA Steaming DVR in the market and Amazon's premier streaming device doesn't work with it!
You can try and present your case by working to find some mechanism to get a hold of some type of support from Amazon - or - you can factually shame them in public and wait for THEM to call YOU!
Join the other Tablo/Amazon customer's who are publicly outing this problem. (You can search the user reviews on the page below for the word TABLO and find several postings):
I WOULD ALSO SUGGEST: After you search all the 4K FireTV user reviews for the word "tablo", please be sure and click on the button which says you "found the review helpful". We can all help push this problem in Amazon's face by not only posting our own 1 star factual reviews, but also by repping all the other "tablo related" 1 star reviews as "being helpful"... If Amazon thinks that specific negative reviews are turning customers away...
Don't kid yourself... Amazon is watching!