I had the same problems.
I did the factory reset and it cleared up most of my problems, except that now I can't sync with my company's outlook exchange.
Taskkillers if you have any, you should get rid of.
If you are using push for email you should set that to 15 minutes.
Those two things were my biggest culprits and fixing those helped... but not like the clean wipe did.
My phone was basically going from fully charged at 8am to dead by 2pm with almost no usage.
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