gallery crushing

hey guys,
I have a galaxy nexus maguro and whenever I try to open my gallery it displays the message "unfortunately gallery has closed"...I have tried downloading a different application as my gallery but it has not helped as it says it cannot connect to the camera which is also affected but at times something happens and everything goes back to normal then it goes back to being abnormal after a few days

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Clarification Request

I have tried all those things but nothing seems to work.

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Things to do.

1. Reboot.
2. Make sure there is plenty of free memory (as there are no less than 3 memory areas and well discussed on the web, I stop here.)
3. Factory reset the phone.

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