macbook pro (built in) keyboard not responding
Hello everybody.
New to this forum.
I have a Macbook Pro retina (late 2013) with i5 2,4GHz processor, 16 GB RAM, 250 GB SSD.
Running the latest Yosemite version.
My problem is that my (built in; not a bluetooth!) keyboard becomes unresponsable when I switch between programs.
For example,
I use TextEdit to write a text. Copy and paste the written text into a web page in safari. Then, returning to TextEdit, the keyboard doesn´t work!
It seems to have lost its focus. In order to this thesis, I click on upper frame of the TextEdit window, and suddenly the windows changes position on the sceen and the keyboard works again.
This "losing of focus" occurs not only between TextEdit and Safari. It happens to me with a variety of different program combinations, but not everytime...
This is terribly annoying and but I am just missing proper knowledge.
Thanks for any help.
[Hope you understand my English, not my mother tongue]
MacBook Pro (Retina, 13-inch, Late 2013), OS X Yosemite (10.10.1)