UPDATE: So, its true - UVB-76 has stopped the transmission on September 1, 2010 4.05amUTC just like that - last buzz and all static after that. Pease find the archive recording here.
If this is the end of it or will the UVB-76 return to its regular transmissions is difficult to speculate. It is clear however, that it is not an atmospheric or propagation issue at the moment.
[OLD POSTING: The buzzing has been absent for quite some time now. Report sais, that on August 31, 23.27UTC the carrier switched off and has not re-appeared since.
Currently there is no sign of any carrier frequency on WinradHD screen. On this time of day the atmospheric conditions should allow reception even with the very bad propagation conditions, so it is highly unusual to not have any signal.
I will seek it out from archive and post the recording of the signal stopping, lets hope that it will re-appear!]