nanodac dual input channel setup problems - for Dual T/C input type

We are experiencing problems with our attempt to use the dual input channel option.
I'm aware that there are many caution notes pointing towards taking special care with input adjust procedure.
1- My first question is whether any one has experienced problems using the dual channel option (in our case, we are using 4 primary and 4 secondary channels) or while performing the adjust input on the secondary channels?
2- Are there tips or comments that we should be aware of when performing the adjust input, that could result in the problems we are observing with the temp readings with the 4 secondary channels?
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