flows statistics unstable when 80k flow configured

used odl: distribution-karaf-0.3.0-Lithium-RC1-v201506160017.tar.gz

installed feature: odl-openflowplugin-flowservices-ui-li

when installed 80k flows, they were not collected, but after mininet restart all flow were collected well

then after some time 4 switches were lost from inventory

(1434487760.13342, 63, 74567, 74120)
(1434487792.004231, 63, 79567, 79000)
(1434487821.56991, 63, 79567, 79000) HERE ONLY 79k of 80k COLLECTED
(1434487850.850809, 63, 79567, 79000)
(1434487881.234324, 63, 79567, 79000)
Could not retrieve inventory, response not in JSON format
(1434487896.83477, 0, 0, 0)
Could not retrieve inventory, response not in JSON format MININET RESTART
(1434487926.857697, 0, 0, 0)
Could not retrieve inventory, response not in JSON format
(1434487956.889432, 0, 0, 0)
(1434487991.114253, 30, 34490, 32880)
(1434488028.17617, 56, 68324, 67820) 7 SWITCHES LOST FROM INVENTORY
(1434488059.341353, 63, 80567, 80000)
(1434488089.260265, 63, 80567, 80000)
...
(1434488384.822826, 63, 80567, 80000)
(1434488419.865389, 59, 75451, 74920)
(1434488450.665859, 63, 80567, 80000)
(1434488475.408658, 63, 80567, 80000)
(1434488510.034752, 63, 80567, 80000)

this can be just another variant of the same problem, which was reported here
https://bugs.opendaylight.org/show_bug.cgi?id=3735, but stats collectio in Lithium RC1_June15 looked more stable than in this LIthium_RC1_June16 build