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try to exit out of the program and shut it do

try restarting your computer

if those do not work try updating your soft ware

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it could be the site or program or or a bad file or program.

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how to handle freezes and crashes.

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turn on safe boot . this could help reveal the problem.

if that does not work try reinstalling macOS over the existing one

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could be a software issue/or a software related problem.

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screen completely blacks out.

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application may be incompatible with the system

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Things unexpectedly exit.

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close all programs and restart computer.

turn of virtual memory.

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make sure that the speech settings haven't been changed to use Y  as a trigger to speak selected text.

If that does not work maybe reinstalling macOS could solve your problem

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it could be the browser your in or it could be how your settings are set.

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a certain key on the key board that sometimes does not work