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ADS1299-4: About resistance measurement function (LOFF(AC))

Part Number: ADS1299-4

Tool/software:

Hi team,

I am reposting this because I am not getting a reply.
I want to measure the resistance in the following schematic.
I posted only one channel, but I am posting the real circuit because I thought it was possible that other channels may have been affected.
I actually measured 3 channels in parallel.

If I set the current flowing for resistance measurement to 6uA, the voltage will saturate,
I am trying to set the current to 24nA, but in that case the voltage will fluctuate.
What is the cause of the fluctuation?
Which voltage should I use to calculate the resistance?
(Peak voltage? Average of fluctuating voltages?)

Best Regards,
Ryu.