My iphone 4s s screen blanked out today, is this normal?

After sending a text, my screen went black and there was no response, so I had to press the home and power button simultaneously to get it on again. Is this normal?

You probably had too many processes going/were low on ram/memory. Try deleting the apps (double tap home then make them wiggle) after you use them to avoid this in future. It happens alot less to me if i do that

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