Tvheadend

Hi, Have been using tvheadend on & off for a few yrs and first time I've had this happen.

When I set up DVB-T adapters, everything works OK & I scan & set up channels OK. But config data does not seem to be saved as every time the system is rebooted all settings are lost & I have to start again.

Suggestions on how to resolve much appreciated

Thanks
Garry