More than once, (four times, I believe), The game has crashed after I see the words (ECHO COMPLETE) at the top of my screen, and the Portal button has appeared. I come back and my progress has been lost even though the only thing I needed to do was teleport out of the Echo. I feel like there should be crash proofing for echoes.
As in, if you don’t leave by death or a portal your progress is saved the last spot you were at the crash/dc. Granted, this would leave you possibly vulnerable to death, but it gives you more of a chance than simply resetting the echo and removing your progress.