crash when doing Acoustical parameters...

I thought that for for instance T20 one only needs 35 dB and in my file I see a S/N of some 40 dB in the decay functions.

As ISO3382 does not specify the S/N range very well for most parameters, I try to have at least the dBs mentioned in table III of: www.levelacoustics.nl/research/publications/2012%20-%20Measuring%20Room%20Impulse%20Responses%20-%20Impact%20of%20the%20Decay%20Range%20on%20Derived%20Room%20Acoustic%20Parameters.pdf

Sometimes there is indeed noise in my measurements; can be wind around neolithic monuments.
So could I get these errors for each band and/or for each parameters (depending on my recordings: sometimes I get non, sometimes several up to four)? I just want to understand when I can expect them. Thanks.