Creating Groups within Report Table Fields

Has anyone else encountered a very very long time and/or locking up when trying to create a GROUP within your Fields (when in Reports) on Desktop?

For Example:

If you had a table for Products and 1 column listed a particular Product Class like Products A-Z

When I try to Group Product Classes into a few Master Classes like

Products A-G under a Group Name "Master Class 1"

Products H-M under "Master Class 2"

Products N-S under "Master Class 3"

then I left Products T-Z in the Ungrouped, but clicked the box for "Include Other Group" which I named to become "Master Class 4" which should do the same as me selected Products T-Z and making a Master Class 4.

When I click "OK" to create these groups Power BI Desktop has not had a box saying "Working on it" and spinning its circle for over 30 minutes.

I have made other Groups on some other tables without any issues but this always seems to happen when the list is a little larger being split into groups, but I haven't tested more to see if this is occuring because i'm using the "Other Groups" rather than actually making that last group. I wanted to do it this way so when we create more products later they will at least default under that Other category since they will 99% of the time go into that if we create them.