Problem receiving text messages while on LTE

I've been having problems receiving text messages while connected to an LTE network. Outgoing messages send just fine and everything else works properly as well. I was able to nail the problem down to LTE when I realized that texts were flooding in while on phone calls. This is because while on a call it switches from the 4G LTE network to the 3G HSPA network. I did some further testing by having people send messages while on LTE (didn't receive them) and then by changing my preferred network type to 3G in the Settings menu. The messages came in only after doing that.

I ditched my '13 Moto X for a One M8 last year because of a similar issue so it seems to be a problem specific to Moto, though it obviously is not a widespread issue. I'm not rooted or anything. I don't have any apps installed that could be messing with it.

I'm not sure where to go from here. Does anybody have any ideas? I turned LTE off a couple weeks ago and it isn't ideal.