[knot-dns-users] Problem with expiring zones - new stable version

Hello, after upgrading to new stable version 1.4.7 we noticed a problem with zones, which are expiring (i've seen some bugfix -expiration timer). It happened second time now, and i think its happening every week (7days). Zones, which expired are selected randomly, count of expired zones is ~8. expired zones are listed like this: somezone.net. type=slave | serial=0 | bootstrap idle | After manually refreshing zone everything works fine. TTL is 86400 - 1 day We are using knot as slave dns. Bind9 is master. Thanks for some advices. Jakub