I made my own thread with these questions.....no answers. (I did only post today....I'm impatient, sorry

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Sorry if these issues have already been discussed.
My first question.....I game quite often is it okay just to jump on the set and start gaming. I have the settings dialed down to reduce IR.
Second question.....I have an Onkyo TX-SR705 hooked up to the tv through HDMI. When I use my PS3 and 360, I have the signal drop at random. My cable box is direct connected to the tv via HDMI, no drops. I also direct connected another Xbox360 to the tv via HDMI, no drops.
Third question.....I saw some "line bleed" during a preview screen before a movie. Is this a normal thing to happen with this tv?? (doesn't bother me too much just curious)
Fourth question.....I purchased this tv as an open box item. Is there a way to check how many hours are logged on the set. Last, for "break in", is it okay to just use the tv like normal as long as I have contrast and brightness at "50"?
This is my first plasma, so bare with me. P.S. The tv has the latest firmware.
Thanks