NASA statement July 21, 2014.
The change coupled device (CCD) is the part of the camera that is the light sensitive. EIT does CCD bakeouts to improve the CCD performance every few months. During this time EIT does not take images because a warm CCD doensn't have the high performance needed to see extreme ultraviolet light (EUV). The bakeouts typically last a day of two, read more in the second video.
A similar event took place in 1998.
NASA statement February 4, 1998.
SOHO EIT light leaks. It appears that the the SOHO was struck by a micro meteorite shower in the early morning of February 4, 1998. As a result, all four EIT sectors now show light leaks, apparently the result of pin holes in the front filters.
So what is it? A Bakeout, SOHO struck by a meteorite shower or NASA is hiding something?
Another strange message appeared on NASA's Twitter account, I don't if this message is related to the strange event above the Sun. See image below.