From the photo on the RC forum
Well I can't see anything from the links on the first post. Just a page of Chinese characters for the first, and just Russian text for the other two.
You did not say it was a switching regulator in the first post. In my first reply my comments apply to a linear regulator.
If it is like the eBay ling then it looks a bit amateurish, it looks like someone has just laid out a data sheet circuit with insufficient testing. Switching regulator PCB layout is very hard to do properly. So it is likely that you can get high voltage spikes through one of those.
Have you measured these on an oscilloscope? It is the only way to tell. I would put a pi circuit on the end to add extra decoupling and spike protection.
It is the last circuit on this page:-
http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html