bgp update destroying transit on redback routers ?

[Igor Ybema <igor () ergens org>]

Hi there,
Since about 15:00u GMT we receive bgp updates from our transit which
destroys the bgp sessions with them with message:

send NOTIFICATION: 3/9 (update: optional attribute error) with 11 byte
data. mxReadMs=610

We use redback smartedge routers (SE100) currently for BGP.

Anyone who have seen this also?

regards, Igor