BDV-N5200W black flash

[looksharp]

I just bought a N5200W. The picture goes blank every ~5 seconds when using any of the internal functions - e.g. BD, netflix or simply browsing the menu. Chromecast connected to HDMI1 and PS3 connected to HDMI2 provide a steady image. Have tried different HDMI cables that worked for years. Have latest firmware. Have done factory reset. My TV indicates no sync issues.

Any suggestions? 

Looks a bit like this: http://www.youtube.com/watch?v=5Rp1GCLqfbw

Edit: Nevermind, I'll try to return it.