It could be that you are running something that causes the CPU to be running at 100% all the time, or you have concurrent apps/processes that are keeping the CPU awake (same effect as the CPU running 100% all the time).
Yes, you can buy the Samsung Galaxy S4 directly from Samsung.
Yes. They have the Samsung Galaxy S4 Active.
Yes, the Samsung Galaxy S4 is a smartphone.
No, the Samsung Galaxy s4 is larger than the iPhone.
The Samsung Galaxy S4 was released on April 2013.
Yes, Amazon.co.uk does sell the Samsung Galaxy S4. They have a wide variety of Samsung Galaxy S4 models and accessories available for purchase directly through their website.
The Samsung Galaxy S4 accepts a micro-SIM, but not a nano-SIM.
The Samsung Galaxy S4 mini is more popular than the S3 mini.
An unlocked Samsung Galaxy S4 is presently between $550-650 USD.
The Samsung Galaxy S4 is not waterproof. The Samsung Galaxy S4 Active however is water-resistant, meaning it can withstand water (and dust), but can only stay submerged for 30 minutes for one meter or shallower.
The best examples of Samsung wide phone range is as follows; Samsung Galaxy S4, Samsung Galaxy S4 Mini, Samsung Galaxy S3. They also have other products available.
No, even if you factory reset the Galaxy S4 it will not downgrade.