Okay this is the same situation I'm having except my data drops at the MOST inconvenient times! My phone was OTA updated to 20k when I got it so it's safe to say I'm on the most recent modem, and also rooted the same way with locked bootloader. I've tried the "KitKat AOSP" modem and get the data drops also.
Can someone please shed some light on this situation?
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Yep, you can click on it