My game crashes randomly (freezes and becomes unresponsive, have to ctrl-alt-del, with the same error as the second line in your log_metro:
Error: Runtime error in "metro/scripts/engine.script" at line 314: Internal error!
Which is §delete.timeline or something.
Removing line 314 §delete.timeline from engine.script results in a crash with reference instead to line 312:
MAIN.$grid = null;
There is nothing noticable that triggers this. Sometimes it comes almost immediately, other times it takes an hour or more.