Checked just now in a mission (after hotfix 34.0.2), and it still happens, still have no idea why. Doing some more testing (I almost always play online, not solo) and it seems to not want to trigger when in solo mode, so it might be due to some lag between mission host and allies? I've spent 10 minutes aimgliding through portals in solo and it didn't trigger, then I joined a mission (in this case Elite Sanctuary Onslaught, but it happens on all maps) and it happened on the first Wormhole, but then not for a while.
In most missions I tend to use Wormhole towards the end when everyone's running to the exit, and it doesn't seem to depend on time connected to the host as it still happens randomly in those last moments. Some more recent testing and it doesn't even seem to even need aimgliding to trigger the random direction camera change, no clue why it happens or how to reliably replicate it.