named time-out errors

[scole_mail <scole_mail%gmx.com@localhost>]

I've been running my own forwarding bind server for awhile, and after
updating my i386 7.0 machine about 2 weeks ago I started get named
errors like

24-Mar-2016 09:58:50.695 client 0xb992b800 (svn.freebsd.org): query_find: unexpected error after resuming: timed out
24-Mar-2016 09:58:50.695 client 0xba055800 (svn.freebsd.org): query_find: unexpected error after resuming: timed out
24-Mar-2016 09:59:38.533 client 0xba055800 (svn.freebsd.org): query_find: unexpected error after resuming: timed out
24-Mar-2016 10:01:36.877 client 0xb992b800 (mail-index.netbsd.org): query_find: unexpected error after resuming: timed out
24-Mar-2016 10:02:10.022 client 0xb980b800 (mhonarc.org): query_find: unexpected error after resuming: timed out
24-Mar-2016 10:03:28.970 client 0xb980b800 (www.netbsd.org): query_find: unexpected error after resuming: timed out

I noticed because name lookups were sometimes slow or failing, but most
of the time things work fine.

BIND apparently had been updated to 9.10.3-P4 recently.  I didn't
change anything in named.conf, but maybe I should.  Anyone have any
suggestions what to look at?

Thanks