I logged on recently and my ender chest appears to have emptied itself. not sure how or why this happened but help appreciated EDIT: i think my inventory was also emptied but not 100% sure
My best guess is you used an ender chest on one smp and moved to another smp. Your invent does not move and stays on the same smp and same with ender chests. The only way to move items a cross smps is to put the stuff in your vaults first.
If it's been that long, you might not have noticed. I'd recommend checking, by pressing Tab, for example. Assuming you do remember which you were on.
There are ender chests at every (town) spawn (including utopia), so checking on every smp doesn't take long.
Based on your session logs you change smps quite often. Mostly between 2, 6 and 9. Your residence is on smp6. I would check those locations as ender chests don't just go empty. Hope that helps.