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It depends on the history of the company you are working with. If company has been fair with you in past you should be also loyal to the company. But it is not hard & fast rule, you can plan when will you switch. If company continuously in crisis. Eventually you have to switch so you will not be in crises.
Express your gratitude by supporting the organization to rebuild back to its position Because that is what the company did for the employees to sustain themselves by providing job, salary, incentives etc.