Tvheadend

Hello
I've noticed that tvheadend settings change after reboot. At first time tuner #1(DVB-T) is at /dev/adapter0 and tuner #2 (SAT) /dev/adapter1 then I setup all the channel and this is OK. But after reboot tuner #1 is on /dev/adapter1 and tuner #2 is at /dev/adapter0 (they swapped logically but not physically, I dont't know why) so configuration is lost. I setup all channels again.
After some reboots situation is stable but it may happen that channel numbers changed and so streaming urls are no longer valid.
Do you know how to keep configuration stable (or re apply a saved configuration)
Many thanks for any kind of help
Zbb