For issues you find with the Switch and Console releases, please follow this link and give as much detail as possible. This is the speediest way to get info to Pipeworks and get a hotfix in the works.
1.4 will bring many changes to the PC version. We strongly advise making plans to back up your worlds and players prior to updating your game. More details here.
Begin your search for Journey's End information here and here. Please report bugs and issues for Journey's End here.
For issues you find with the Mobile 1.3 update, please follow this link and give as much detail as possible. This is the speediest way to get info to DR Studios to look at your issue. Also, some troubleshooting hints here.
^Was about to write this, I can't believe there are still people who believe RAM is the key to better performance in games.
Edit: But to be fair I think RAM is important for Terraria because if I'm not wrong lots of it is needed when creating worlds, then again even 100$ phones come with 3GB since 2017-8 so yeah RAM is irrelevant