Only happening on one character and it started right after I finished leveling alchemy in one sitting. Happening every 15-20 minutes now. I’ve tried resetting my Xbox and logged out for a few hours and still having the issue.
I have a theory that it occurs if you are doing something that puts you into an inactive state for a long period without being AFK- in your case power levelling alchemy, in mine I sat on a single siege engine for a long time sieging.
i raised a ticket and after getting through 3 or so automated emails I got through to CS who did something to my account that stopped the error 307 happening all the time. I would suggest raising a ticket