Mac book air 11 inches go in stand by when moved suddenly

i noticed it happens especially when is taken form down to up or up to down lik for instance form my lap to the desk, which is about 10cm change of hights.
the screen goes black, and when I touch the track pad it goes on again and ask me for the login pasword. once in all the programs are on as they were before stand by..
I have checked the system report and i dont have any SAS device installed in the computer, so how does this happen?

no I dont think so...nothing on me that I know. And it happented to me in 3 different places. the first time I thought it could be the external hard drive I was using. cos it went on stand by twice then after disconecting the hard drive it did not do it anymore. but the other times it was completely wire free. is definitely something related with movements

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