I also have this exact problem. I tried to comment on Jira but it did not seem to let me.
I am using Chrome version 34.0.1847.116 m (don't know what the 'm' part is".
Couchbase in my particular case is community 2.2.0. I have seen it on both linux servers and windows servers.
The issue is that if I leave a console up on a bucket (with the graph set on the minute interval)... and come back in a few hours... chrome will say that it has stopped responding.
It is possible that part of the scenario is putting my monitor locked. (hitting windowskey-L).