AMS-IX @ 350 Cermak issue?

Anyone else having issues with AMS-IX at 350 Cermak? Our circuit has been bouncing on and off all day. I'd suspect our optics/port, except that when it's up, some BGP sessions come up, but not all. The ones that don't come up aren't pingable. Leads me to believe it's not us. E-mails to their NOC have gone unanswered. Thanks all ...