It takes me about 4 or 5 attempts to get my S2 to power on when I press the power button. I am pressing the button solidly/firmly and holding it down for at least a second but more often than not, it takes a few goes before the tab will turn on. My other Samsung tabs or phones have all powered up easily on first attempt. The button isn't sticking or anything; it is just completely unresponsive at times. No problrns with powering off. Is this normal for the S2?