boot0 loader minor problems

[EforeZZ]

Hello,

I have a minor problem with boot0 loader on Acer Extensa 5220.
I have four slices: FreeBSD, Windows, FreeBSD, FreeBSD.

The problem is that sometimes boot0 code loads OS from active
partition no matter which of F[1-4] I press. Sometimes boot0 code
starts loading OS from the default slice and gives me no chances to
select the slice to boot from (I have ticks=12000!)

Should it be a problem with my buggy BIOS?

Thanks for any suggestions.

Best regards,
EforeZZ