Desktop strange issue


hi guys,
times (not often) desktop darkens, , menu bar , disktop icons disappear, while dock remains. have click in order return!
causes thing?

p.s. before awhile, happened again, looked @ console , saw these 2 events:

1)**** [iobluetoothhostcontrollerusbtransport][suspenddevice] -- suspend -- suspenddevicecallresult = 0x0000 (kioreturnsuccess) -- 0x3000 ****

2)setpresentationoptions called nsapplicationpresentationfullscreen when there no visible fullscreen window; call ignored.

cannot specify exact time happened, in order see if of 2 messages related.
 

hi all,
experience once week following issue:
screen darkens, desktop icons disappear. however, when click, comes normal.
attach 2 photos, 1 desktop @ time happened last time, , 1 message in console (i not sure if related problem, thought wise show you).
ideas, please?
[​img]
, this
[​img]
p.s. macbook pro 13'' (mid-2012, os x 10.9.5)
 


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