Hello, looks like your host has some underlieing issues with the way your nameservers have been created...
the time look up test in dnsstuff gives me a F, gets me worried
Some of the points used to calculate that score are as a result of this:
"WARNING. The parent servers (I checked with tld2.ultradns.net.) are not providing glue for all your nameservers. This means that they are supplying the NS records (host.example.com), but not supplying the A records (192.0.2.53), which can cause slightly slower connections, and may cause incompatibilities with some non-RFC-compliant programs. This is perfectly acceptable behavior per the RFCs. This will usually occur if your DNS servers are not in the same TLD as your domain (for example, a DNS server of "ns1.example.org" for the domain "example.com"). In this case, you can speed up the connections slightly by having NS records that are in the same TLD as your domain."
Not much you can do about this, as the domain is a .in and the nameservers are a different TLD
the rest of the points are glue errors - associated with your nameservers. You should send your host a link to the reports for dnsreport above as well as the dns timing link for that domain, they should be able to correct this pretty quickly.
If you have been with them for some time and you are happy with their service, i would certainly give them the chance to correct some of this for you.
Hope this helps....