Odd behavior while booting off Install media for 9.1...

[aurfalien]

... sometimes I get a normal boot procedure were I can proceed to install.

Other times I get the mountroot prompt and upon pressing enter, the system reboots.

This seems random with the same hardware setup.  I literally have to stare at the screen for it to finally push through to the install procedure.

I'm clearly new to freeBSD and was wondering what is going on here?

I'm happily installing now as I managed to find time and stare at the screen long enough but would like some insight n this if possible.

- aurf