Once I was interested in expressing that idea as well, and the word I found to be appropriate was 'glitch'. This is what I'd use now. My computer glitches sometimes.
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User_garySometimes my computer stops working and become stagnant. At that time I have to restart my pc.I don't know how to say that sentences. I can think of the following variations :Sometimes my computer locks.
(1) My computer hangs sometimes.
(2) My computer freezes sometimes.