For the first time ever, A1 is getting so far in the cleaning cycle and then becoming unresponsive (not the usual slow for big files).  I have narrowed it down to some temp files (I think), but I wonder if Ray has heard of a problem as I explore further to narrow it down.  It may have occured after a Windows update but many other programs of course are updating.  Suggestion for the future - include the option instead of excluding files, to instead to only include files.  Would make the troubleshooting go faster.

   My guess is that A1Click is just busy scanning files and directories.

Ray, it can be repeated and even if left 6 hours, it does not become responsive.  I can block those few temp files and it zips very quickly.

   Your comment about including and excluding files made me think that you were talking about A1Click scanning for problems.
   After rereading your original post, it seems like you are talking about the cleaning process.  If it is the cleaning process, then my guess is that you have the No Remains Deletion on.  On huge files it can take hours and if your computer cannot handle it, it may freeze up.  With No Remains Deletion, A1Click goes to each byte of the file and rewrites the bytes many times.  This can take a very, very long time.
   I suggest that you uncheck No Remains Deletion.

Ray, thanks.  That did get rid of the "unresponsive" problem while cleaning.  Interesting though, during the full clean, the files causing the problem, were not cleaned, but ignored.