pg_stat_replication in 9.3

Hi,

I noticed a strange behaviour regarding pg_stat_replication in 9.3. If
called from psql using the \watch command, I see all my replicas. From
time to time one of them drops out and reconnects in a short period of
time, typically ~30 sec.

If I use the same select in plpgsql like:

FOR r in SELECT application_name,
client_addr,
flush_location, clock_timestamp() AS lmd
FROM pg_stat_replication
ORDER BY application_name, client_addr
LOOP
RAISE NOTICE 'aname=%, ca=%, lmd=%, loc=%, cur=%, lag=%',
r.application_name, r.client_addr, r.lmd,
r.flush_location,
pg_current_xlog_location(),
pg_size_pretty(
pg_xlog_location_diff(
pg_current_xlog_location(),
r.flush_location
)
);
END LOOP;

I see one of the replicas dropping out but never coming back again while
in a parallel session using psql and \watch it indeed does come back.

Is that intended?

Torsten