I’m experiencing an issue on build 4107 on Ubuntu 20.04.2
The cursor (on a particular document) sometimes freezes and won’t move until I close and re-open the document. Cursors on other documents in the same ST4 window work OK.
In general ST2 and ST3 have been very reliable for me, which is the main reason I continue to use ST4 as my daily editor. This might seem like a minor ‘niggle’ … but please take this sort of thing seriously. I don’t want to lose faith in the quality of the product.