We're really sorry to have put a ceasefire on all alliance warfare events in progress. In order to prevent players from continuing to experience a loss of dog tags, we have temporarily disabled alliance warfare in Battle Islands. Right now this is the best solution to prevent more players from having their tags reset. We will reinstate alliance warfare as soon as a patch is released on all platforms which fixes this loss of dog tags.
Please create a support ticket if your dog tags dropped to 1000 since the last update. The support team can check what your dog tags were before the drop and reinstate them.