theres a fine line with the cables, too loose and it wont engage, too tight and it might go ahead and engage on you when you turn your bars or hit a bump. I generally have nil issues with my KS LEV posts, both internal and external, but my KS eten is a frustrating piece of junk. i figure its because of the underseat actuator and the cable routing that needs to bend somewhere every time it drops, so probably not an issue on yours. Having said that, i'd definitely look into the routing, see if it has any points around suspension pivots and steerer or where it might stretch or snag. and if its set fairly tight, try loosening off just a touch so that there's a mm or two of play in the lever as a buffer.
If its still dropping after that, you might need to look at a rebuild. if the eten isnt a cartidge type.