Hello @joelbean,
As I’m based in Australia, one of the Peplink Community in America may be able to check for you.
Also, @sitloongs did mention that there is an issue that will be sorted with a future update. Keep working through your support ticket, Peplink may be able to give you a beta release in the near future to resolve the issue.
Stuff like this happens with all vendors as carriers/ISP change their networks at their own digression (interprets the standards in their own way), this affects the way all mobile/cellular devices operate and is especially noticeable on commercial equipment where we have access to this additional in-depth information. Working with Peplink we found a recent change to the Telstra network here in Australia was affecting the way the Cat-18 chipsets behaved. Peplink worked with the chipset manufacture to deploy a patch, these patches/updates normally get made available in the future major firmware updates.
Happy to Help,
Marcus 