Long, Intermittent Delay for Incoming SMS

Per the title, we are having some trouble with incoming SMS messages. 

We have 2 GSM modules, and we're having trouble with each of them receiving SMS on a long delay, in some cases several days, before being emailed out. 

Interestingly, the logs are showing message receipt immediately before the email is sent.

We've got excellent carrier signal strength when making phone calls, and the physical SIM cards have been tested in cell phones to be sure there wasn't a carrier issue, so we're a bit at a loss. 


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