GAMMA Questions

Hi all,
I know I have been doing a lot of questions over the last week and I am sorry about this but your help has been very useful.
I have completed the coregistration of my Sentinel stack with S1_coreg_TOPS and also the interferograms associated to this step look fine so I have now moved to the IPTA part.
After the generation of the point target candidate list with a large data stack made of .rslc, therefore with the script pwr_stat, now I have a problem in the following step, namely the extraction of the point list SLC values from the co-registered SLC, with xpt_slc. I have tried to use data2pt as well. In both cases the program works but the next step, which from the manual should be intf_pt, is not working. Even if both scripts work, it is like the program xpt_slc cannot find a peak in the surrounding pixels.
On Monday I can make also make a screenshot of the error.
My question is:
Should be the searching window bigger (I used the default 2x2)? is there some step I should do before the SLC point data extraction? or there should be another intermediate step between xpt_slc and intf_pt?

Thanks in advance!

Alessandro