domains4bitcoins can't be trusted and have no real customer support it seems.
I bought three domains from them in the last two weeks and all have been
suspended without any notification or explanation.
First time I sent a mail to
support@domains4bitcoins.com I got a generic "sorry we will look into it" answer.
After that I get nothing. No explanation just silence.
Basically they took my money and then decided on a whim not to provide the agreed upon service without even explaining themselves.
Edit: They explained their actions but it doesn't justify suspending without notifying the owner there is a problem.