My iphone 5 keeps crashing?

Everytime I will use apps in my iPhone for about 5-15 minutes, it will always crash. And after that, the "Photo stream" will pop up saying about my iCloud.

The reason i can't fix the problem of my iCloud is I can't delete that iCloud account which is my old account. I can't delete because it requirs the password which is I already forgot.

I'm planning to reset my iPhone but I'm afraid that apps and photos will delete.

I'm not too worrying at my apps because I downloaded them from my new account.

I Don't think you can reset it, if you forgot your old account Id. But worth a try.

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