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.
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.
Does the crashing happen 100% of the time? Does it happen in every world and with every character, or just one combo? Do you have any traps or automated farm/grinding statues set up in the ocean? If you switch out your armor does it still happen?
Please pardon the double post, but I wanted to follow up with some new info @BlueBlankTank. A bug has been identified on large worlds at the ocean on the right. If your world is large and you're crashing at your right ocean, a workaround is to zoom all the way out.