When the PS3 changes it's video output from one resolution to another, then your TV will display the status of the new video resolution. HDTVs have a fixed resolution and use a video scaler if the incoming resolution doesn't match the TV's. The message you see on your TV is telling you what type of signal it is currently getting.
But even if the video output isn't actually changing to a different resolution (it was at 1080i for the XMB and it is also at 1080i for a game), your TV may still be detecting a momentary interruption in the signal, so it still has to recheck the incoming signal so that the video scaler is set properly, so the message appears even though it is still using the same video mode.
It may also be resetting the video scaler because of HDCP (High-bandwidth Digital Content Protection). Devices with HDMI connections can check to make sure that you are not attempting to bypass copyright controls in the HD signal. The process is called "HDMI handshaking", and it is a communication that takes place between two or more HDMI connected devices. When these devices talk to each other, the signal may momentarily drop out, so your TV may go blank until the handshake is complete, and when it is over you see the video signal status message. The PS3 may be required to perform a handshake everytime a video disc or game is initiated.
It would help to know what resolutions your TV supports (720p, 1080i, 1080p). If your TV can't support one mode, then the PS3 may force a game to use a different mode.
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