Check this note. Maybe it's an issue with your relays. It you have too muxh relays that DL the same content, your data consumption might explode.

nostr:naddr1qq9hyetvv9uj6um9w36hqq3qgcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqxpqqqp65wjvcq4q