Just a week ago I visited our relatives. But that's besides the point. Read user replies at http://reviews.cnet.com/flat-panel-tvs/sony-bravia-kdl-52z5100/4505-6482_7-33485045.html
Now call Sony and ask if they will offer any one-time repair or a deep discount on the next set.
I have a Sony Bravia KDL-52Z5100 that keeps power cycling. The TV turns on, works fine, then the volume goes and then the TV turns itself off then on again. This happens several times until it just stays off. Any suggestions?