Brand new LG 60PN5300 plasma turning off by itself.?

I purchased a *brand new* (not open box or refurbished) LG 60PN5300 plasma television (60") on the 26th. After approximately four hours of use last night (the 27th) it started turning off. At the time I was watching Netflix via a PS3 in a climate controlled house (not outside). After it turned off I used the remote to turn it on again, and five to ten minutes later it turned off again. This happened about three times before I started trying to research this problem (with the TV off). When I turned the TV back on after not finding a suitable answer, it remained on for the remainder of my viewing (about another 30-45 minutes). What gives?

Thank you.