Trados Studio 2017 understands some letters as "ctrl +" commands

I have a lot of problems with Trados Studio 2017. It works very slow, and I can't type fast or it makes strange things like when I write "a" (in a word) it understands it as "ctrl + a" and selects the whole segment. This affects also some other letters, which Studio understands as "ctrl +" commands. What could be the reason for this?

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