Roughly 10-20% of the time when I enter a nether portal, the game freezes (usually it freezes on the loading screen, though sometimes it freezes before the loading screen comes up). I have to close the program and restart it (I receive a "closed due to error" message in the Switch menu). Usually upon reloading, the game has reverted to a prior autosave, but occasionally it restarts to the dead player screen, with the death message that I have fallen out of the world. In the latter case, the "respawn" button usually doesn't do anything and I have to again close the game and restart it in order to successfully respawn.
I had the same issue in 1.9, though it seems to occur less frequently in 1.10.
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Thank you for your report!
We're actually already tracking this issue at MCPE-43115, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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This happened every time (pixel xl, pie March security update). Tried new portal, same crash as described. Made portal on opposite orientation, worked fine.