Samsung Electronics has lost about 15% of its market value this year as its new flagship Galaxy S6 failed to impress and the founding Lee family was seen solidifying its control over Samsung Group's crown jewel, raising corporate governance concerns.

"S6 didn't sell as well as the market had hoped for, partly because of continued outperforming of iPhones combined with the supply constraint," said Greg Roh, a Seoul-based analyst at HMC Investment Securities Co. "Sales sharply missed the market expectation, which implies that overall technology industry demand for smartphones, TVs and PCs is weakening."

The Samsung Galaxy S6 and S6 Edge have recently been plagued by serious memory problems, as poor memory management is leading to massive slowdowns and random app crashes, including force closes.

Samsung Electronics' mobile chief warned on Thursday of limited supplies of its new curved-screen smartphones because of challenges in manufacturing the screens.

Samsung is already pushing out 14nm technology, using its own Galaxy S6 and Galaxy S6 edge smartphones to demonstrate its impressive new fabrication technology. But most don't know that the South Korean electronics giant has partnered with Globalfoundries, with the latter now spinning up its production of 14nm technology.