Hello @artrevi, welcome to the community!
We’re aware of an issue with temperature bonuses not being correctly re-applied to offline characters after server restarts, this is being looked into and should be addressed in an upcoming patch.
For now we’d recommend depositing all your inventory in a chest before logging off, which should help prevent any possible loss of items should something happen to your character while you’re offline.
Unfortunately, we’re unable to provide any refunds of materials or equipment lost, as there is no MMO-like admin support for the game in official servers, apologies for the inconvenience.