All that glistens.....
Not to question pbd's review, but he's using 1d3 cameras (afaik) and seems to be the first one to report these problems. Imho it's a bit to early to doom Yn's controller, if one select Canon product would show issues this would be attributed to rtfm, broken hardware, impossibly unlikely circumstances and whatnot. I hope Yn will contribute some insight once pdb sends them a description.
Yep, 1Ds MkIII's predominantly.
My overview of the YN-E3-RT is this, if you have pre 2012 bodies get it if you are not going to be a heavy or long session user. If you have post 2012 bodies don't get it, the ST-E3-RT is a much better buy and it is certainly worth $100 more then the YN. If you have paid >$2,000 for a body, $450 per flash then the $100 difference is not worth saving, and at this point in time the only flash the YN works with is a $450ish flash, saving $100 shouldn't be paramount in that market.
As for contacting YN, I have done that before, there is no point. They steamroller you and don't listen.
If any body wants a used YN-E3-RT drop me a PM, I am going to stick to my reduced functionality, but 100% reliable, ST-E3-RT.
I am not down on YN in general, I still have and use their RF-602's, and for manual flash via radio the YN-560II is crazy good value at $75, but they shouldn't be playing in the $150 trigger market.