EC2 Instance Freezes

Couple of options:

Use a larger size, e.g. t2.small or t2.medium - if the freezing goes away it may be memory-related.
Examine CPU Credits usage - if it "freezes" when the CPU credits go low you're overloading the instance. Use a larger one.
Examine the OS logs - in /var/log/*. There may be some clues about memory or other problems.
Once it "freezes" go to EC2 -> Instances -> Actions -> Instance Settings -> Get System Log and see if you get any clues there.

Hope that helps :)

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