DNS dying

[Guillermo Villasana Cardoza]

Please help.. my dns was working a ok... but a few days ago, it started
dying here is what I before it dies:

Oct  3 06:21:10 dns named[17435]: NSTATS 970572070 970416193 0=1 A=21460
CNAME=1
9 SOA=5 PTR=7328 MX=4578 AAAA=19 ANY=7676
Oct  3 06:21:10 dns named[17435]: XSTATS 970572070 970416193 RR=16043
RNXD=1050
RFwdR=11237 RDupR=17 RFail=170 RFErr=0 RErr=4 RAXFR=0 RLame=135 ROpts=0
SSysQ=33
62 SAns=31438 SFwdQ=10140 SDupQ=2976 SErr=0 RQ=41126 RIQ=0 RFwdQ=0
RDupQ=265 RTC
P=40 SFwdR=11237 SFail=3 SFErr=0 SNaAns=16847 SNXD=4190
Oct  3 06:34:44 dns -- MARK --
Oct  3 06:54:44 dns -- MARK --
Oct  3 07:03:31 dns named[17435]: "buhler.com.ar IN MX" points to a
CNAME (umail
.satlink.com)
Oct  3 07:14:44 dns -- MARK --
Oct  3 07:34:44 dns -- MARK --
Oct  3 07:54:44 dns -- MARK --
Oct  3 08:14:44 dns -- MARK --
Oct  3 08:34:44 dns -- MARK --
Oct  3 08:54:44 dns -- MARK --
Oct  3 09:14:44 dns -- MARK --
Oct  3 09:34:44 dns -- MARK --

I know the -- MARK --  is from syslog... but after the last query
made... the dns died. The times it has died the last query is a points
to a CNAME or a Lame server error...
How can I see what is making it really die?

Thanks.