I emailed support about this issue - feedback below:
Yes, it is a known problem, it tries multiple times except that with each try and failure interval between tries increase.
Currently solution for this problem when interval becomes too high is only disable/enable.
This will change in ROS v7.
From what I can see, the BGP peer does not seem to automatically retry - even if I leave it for long (hours) periods of time. Disable / enable immediately resolves the issue (not ideal but it works - ultimately I need reconnect / recovery to be automated).
Yup. Precisely the same story here, and the same "v7" fix -shrugs-
ROS v7 better be truly awesome, because damn, there's a lot of many, many serious issues depending on it.