GTA: The Trilogy – The Definitive Edition has been updated to version 1.03 today by Rockstar Games. You can find out the complete patch notes here.
This patch fixes a huge number of issues. The number of bugs fixed in this update is massive. It is like Rockstar took a huge list of user feedback and attempted to fix it all in this patch. You can find out the patch notes for this update below, or take a look on the support website.