Hello Tumoreno,
You're not alone. Firefly is known to make the game crash sometimes. Bungie is aware of this issue and they are investigating.
https://www.bungie.net/Mobi/en/About/Article?id=14232
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They found this issue all the way back in December and they still haven't fixed it in a patch?
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Sometimes it can take awhile for certain things to be fixed.