What are good general signs to look out for if you are gonna get fired?

I work a stressful job I'm not particularly good at. Get frustrated and complain a lot. Never had any discussion. Most recent performance review was a month ago, said "adaequete and steady" (considerable drop from previous year). It's a salaried job with a fortune 500 bank. I know I could get let go at any time. I'd rather quit than get fired.

Personal anectodes, people who have fired others, been fired, etc. please share. Thanks.

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