Me too after some months my Globe Tattoo LTE receive a poor signal 2-3bar not like previous months it has a very good signal 4-5bar.
Sorry to know that. You can visit this link Network and Troubleshooting | Help | Tattoo - Globe to learn more. You can also raise this to any of our support channels listed at Contact Us for further assistance, and check if there's a need to log a network case for investigation.
Hope this helps.