Default 3G Data disconnection

Hi. Is anybody else having issues with the 3G icon being displayed, despite having no data connection? I get this on occasion, and my only solution has been to cycle airplane mode and hope it connects to the 4G network. My best guess is that my connection is poor, and 3G is just an indicator that it's connecting, not actually connected. I'm on stock, S-off, root and TWRP recovery. Any help would be appreciated, or anyone else having this issue so I know whether or not I'm alone.