My computer turns off randomly and won't always tun right back on. What should I do?

My computer recently started turning off randomly, some when I move it or just when I am sitting there using it. I have also had trouble getting it to turn back on after it turns off. I plugged it in the last time to get it back on, but I can't always have my charger with me when using it. What do I need to do?

Jannalynn...
Try resetting the Intel-based Macs: Resetting the System Management Controller (SMC)
If that doesn't help, try Troubleshooting MagSafe adapters

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