I just got a reply back from Support, and they've refunded the insurance cost plus a bit extra for the lost bounties. I'm happy with that!
They said they're aware of a few issues when logging into asteroid fields and are currently investigating.
Bounty hunting will recommence tonight and I'll be more careful where I leave my ship. Thanks, Frontier!
Good news, grats
The advice given is still valid though....stay well clear of anything solid when logging out.