help!!!fastload warning:rdbms reset or network is down during logon

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help!!!fastload warning:rdbms reset or network is down during logon

hi friends,
since this monday, most of our fastload got following log in the output:
"rdbms reset or network is down during logon."
and the speed of loading data is very slow.

our configuration 16 nodes,142 amp, we need to load about 30-40GB(2000-3000 files) data everyday.

we checked network between our staging server and unix box, there is no problem. even i test on teradata server, we still get this message sometimes.

we can't find any useful material about this problem. and we contacted with teradata cs and ps, they also didn't ensure the reason of this.

it is very important for us.

so is anyone encountered problem like this yet?
very thanks.