I find the same thing, if I end up with a tricky deploy that needs a refresh comparison, I lose the notes. Eventually, I just stopped entering them, or at least anything meaningful.

This also impacts JIRA issue linking. A big package with a bunch of JIRA tickets, have to reselect them over and over again. Would like to see these fields a bit stickier...

There doesn't seem to be any rhyme or reason as to when Gearset deletes the notes. Whenever I put something in there, I copy it onto a text editor because there's going to be some minute failure in my deployment that will necessitate a tweak... and writing the whole notes block again.

Yes, this is a pain when you reuse a comparison, do the comparison, and then realize that you need to make a quick fix to the source for the comparison to go through successfully. Sadly, the original comparison's name/notes are lost