Tvheadend

I have a HD Homerun with two tuners. When somebody else is using the second tuner the swithcing of channels goes wrong.

From TV Headend.log:
2015-04-29 22:02:36.060 [ DEBUG]:eit: completed pid 18 table 00000000 / 00000000
2015-04-29 22:02:36.535 [ DEBUG]:capmt: aap, CA_SET_DESCR adapter 1 par 0 idx 0 8b1bc16791bf3181
2015-04-29 22:02:38.005 [ DEBUG]:service: Net5 HD si 0xde3430 HDHomeRun DVB-C Tuner #1 (192.168.20.100) weight -1 prio -1 error 401
2015-04-29 22:02:38.005 [ DEBUG]:service: Net5 HD si 0x1659600 HDHomeRun DVB-C Tuner #0 (192.168.20.100) weight 150 prio 0 error 0
2015-04-29 22:02:38.005 [ NOTICE]:subscription: 00F4: No input source available for subscription "192.168.20.110 [ intelnuc | XBMC Media Center ]" to channel "Net5 HD"

And another instance:
2015-04-29 22:09:00.005 [ DEBUG]:service: National Geographic Channel HD si 0xc98790 HDHomeRun DVB-C Tuner #1 (192.168.20.100) weight -1 prio -1 error 401
2015-04-29 22:09:00.005 [ DEBUG]:service: National Geographic Channel HD si 0xe30f70 HDHomeRun DVB-C Tuner #0 (192.168.20.100) weight 150 prio 0 error 0
2015-04-29 22:09:00.005 [ NOTICE]:subscription: 0013: No input source available for subscription "192.168.20.110 [ intelnuc | XBMC Media Center ]" to channel "National Geographic Channel HD"

The only way to get things going again is by restarting TVHeadend.