We're getting a lot of reports of vehicles disappearing after put together and then hidden is secluded spots. This has happened on well populated servers as well as our low pop whitelisted servers where it is highly unlikely they're stolen.
This is even after the recent patch put out during Wednesdays(22/06/16) maintenance period.
I have also seen posts on Reddit about the issue https://www.reddit.com/r/dayz/comments/4pfyiu/060_after_1_patch_cars_still_despawn/
We're with gaming Deluxe and have servers in AU, Central US and the UK.