I have a cheap KTC 22" LCD monitor with HDMI input. I have the standard HDMI cable that came with the Dick Smith Freeview DVB-T set-top box.
About 3 times per night, the screen goes completely blue (no picture or writing at all) for about 2 seconds. The RCA-out sound continues, and the composite video output (I have tested with another TV hooked up) is also uninterrupted.
The thing is that my LCD TV never goes bright blue for any normal connection loss (for instance if I pull out a component source or HDMI cable) so that seems to imply the problem is before the monitor. (Except for the fact that composite output is unaffected.)
The only other thing I can think of is the cable, or problems with reception that are only noticed with a digital output.
Has anyone else had the same problem?