Might well be an IP block because of this 86 sites on one and the same IP:
http://sameid.net/ip/186.202.126.18/Autoshun give your site as suspicious probably due to a block of .alvotelexfree dot com.br and DNS issues.
Looks like the parent servers do not have information for your TLD when asked. This is ok but can be confusing.
Error Missing nameservers reported by parent FAIL: The following nameservers are listed at your nameservers as nameservers for your domain, but are not listed at the parent nameservers (see RFC2181 5.4.1). You need to make sure that these nameservers are working.If they are not working ok, you may have problems!
ns2.bardabrahmamogi.com dot br
ns1.bardabrahmamogi.com dot br
Error Missing nameservers reported by your nameservers ERROR: One or more of the nameservers listed at the parent servers are not listed as NS records at your nameservers. The problem NS records are:
ns3.dominios.uol.com dot br
ns2.dominios.uol.com dot br
ns1.dominios.uol.com dot br
This is listed as an ERROR because there are some cases where nasty problems can occur (if the TTLs vary from the NS records at the root servers and the NS records point to your own domain, for example).
Stealth NS records were sent: (when a user queries the nameservers, they inform the user that the zone has been delegated elsewhere)
ns2.bardabrahmamogi.com dot br
ns1.bardabrahmamogi.com dot br
Stealth NS records can also indicate a misconfiguration or discrepancy.
You should take all these issues up with your hoster.
If one would go to your domain registrar an add a third nameserver the problem will have been solved.
polonus