If you find yourself left out of critical conference calls, emails, meetings and project assignments, it can be an indication your manager is preparing to let you go, says Kane.
"It's (being left out of) memos, it's when the boss calls three or four folks together to give them the update on something, and you used to be in that group, and all of a sudden you don't find yourself being in that group, or if they never would have had that meeting without you and all of a sudden you're not there and they say, 'We couldn't wait,'" Kane says.
How to fight back: Sometimes good job performance isn't enough if the people you work with aren't aware of it. Making sure clients, bosses and co-workers know what you bring to the table can help you avoid being cut out the loop and ultimately save your job, says Kane.
"Do your customers, your clients, your co-workers, and obviously your boss, respect what you do and how you do it?" Kane says. "If they don't, you're in trouble. No matter how many widgets you produce, if they don't have the respect for you, then you're vulnerable."