Ivan debilas again install latest official TBS drivers from git (https://github.com/tbsdtv/linux_media/wiki) and return to old HTS Tvheadend 4.1-c0d8614 maybe it's help.
Saen Acro I have box with installed Ubuntu 14.04 x64 (4Gb Ram)and 2x6909 driver from https://github.com/ljalves/linux_media/ Except slow driver loading nothing else is problematic current uptime 3 weeks
Ivan debilas /etc/init.d/tvheadend status Active: active (running) since Fri 2017-06-09 10:03:26 EEST; 4h 18min ago 4h - good fly. cpu load 25% debian 8 + open source latest TBS driver + 4.1 tvheadend. 4.3 with some glue :((
Ivan debilas no any transcoding. 246 channels with descrambling, each channel captured by flussonic outgoing traffic - 1.5gbit
Ivan debilas Active: active (running) since Fri 2017-06-09 10:03:26 EEST; 1 day 1h ago tvheadend ver 4.1 fix the problem.