You mention you had summoned the Colonial ship.If anyone else experiences this, there's a freecam bug (really bad, because Elite is for screenshots): https://issues.frontierstore.net/issue-detail/72184
When the problem happened, was the Colonial megaship in shot of the free camera?
I'm thinking it's possible it's related to that, as it it's a new asset, whereas the Mandalay is not. At some point this weekend I'll be making a Claim so I'll try and remember to try this out from the T-8.