Tvheadend descrambling with newcamd limit 12 sids

Hi guys,
tvheadend will descramble with n line up to 12 channels, if I exceed this for example try to descramble 13 channels it becomes unstable and keeps dropping connection and reconnecting to n line source on endless loop. it was freezing the whole tvheadend instance with latest unstable build but downgraded to 1.4.1555 to avoid the full freeze.