EDIT: I can see why nobody posted a link to that alleged change log. (Just googled for it specifically, did not find.)
In answer to the OP's frustration, I reported an instance of this bug that went singularity awhile ago and am working with the developers to sort it out. One particularly nasty variation, a real nasty one, is where crash or not, your progress can be set back as far as two hours. Ideally, and based on what I did manage to find, your character shouldn't have it's progress reset by thirty minutes since that's really only server side. Instead, it should regularly log your progress as soon as you exit the server, which should create a player cache/log of geo-location data, gear, and statuses as soon as the client (you) send to the server a disconnect/log out request. Once that's created, it's like a virtual bookmark that you can than take with you and use on any server, or your host server, assuming you want to pick your progress right back up.
What's happening here, is that the developers did not account on release that so many individual characters would experience data corruption, and unfortunately, this has something to do with the interactions of the launching client and the server. So, your "bookmarks" get errors, or inventory errors, and these can interact with the server where it tries to throw you back before you encountered a corrupting event (theory from me).
In plain speak, what it means is, that the servers are taking longer to actually record where you were and what you were most recently doing. As servers experience issues with characters running corrupted data (the servers create the corrupted data -- oopsie!), this compounds the original problem. One way to hotfix, since I'm not sure if you've reported your end of the experience (I'd recommend it), is to drop all of your gear, do a 15 second log, come back into the server, and pick back up your items. If you feel that's too risky, change it up.
Drop all of your items, re-equip them, run around for two minutes, do a long log of 15 seconds, and come back in, and it should replace the corrupted hash/data with a new one. It's how I fixed mine, but it will pop up every now and again until they fix character issues. Also, bit of a prepper tip? If you're facing these sorts of corrupted character bugs, and 30 minute progress resets, find yourself a barrel, put all of your stuff in it, play the game for two hours ungeared. Find problems, die, log out to refresh your character, go back into the server, march up to where you stored your gear, and voila! Problem solved in another way. Try some of these fixes, but be wary, if you try these fixes, you do risk your character. I'd recommend this instead: find a place to store your stuff, store it, play for two hours ungeared, go get killed, once a freshspawn, immediately do a long log out, and relog into your server to get a new character yet again with uncorrupted data, than haul it to where you stored your gear.
