Not a known issue, but some AV softwares tend to block internet connection for Eco or other stuff every now and then, not much we can do, those companies are not very cooperative.
Well, i can understand this can be partly frustrating, as we both agree that this is not how it should work from a game-design point, but it's technically not broken and the amount of work required to change the whole system for such little benefit is just a bad trade-off at the current time of lots of stuff that is more important.
That's actually working as intended. We're sure looking into it at some time, but it actually works as it is supposed to work, as maps aren't 3d. It's nothing to expect anytime soon, though, just to be honest.
That means your database was corrupted, you can either delete the .db file (then all statistics start new from now on) or restore the latest one from the backups.