Couchbase 4.0 buckets go in a pending state

Using couchbase 4.0, a couple of times a week we see the couchbase bucket to pending state. After about 10-30 minutes the buckets returns back to normal.

We had the same issues on different machines.

I have collected the logs and but its over 40 mg (compressed) and the forum did not allow me to upload them.

If you need specific files I can upload them.