After getting sporadic reports of issues from our clients using Verizon Wireless 4G LTE devices, we have worked with our manufacturer partners and VZW to connect the dots. Here are the facts. There is an issue with the Qualcomm chipset used on the Sierra Wireless AirPrime MC7750 LTE radio module. The chipset issue does not manifest in all geographical regions, but when it does the following problem can be experienced:
4G WWAN devices have trouble staying connected to the Verizon Wireless network. Apparently, if the device drops out of 4G coverage into 3G coverage, it then has a problem reconnecting. We have seen clients experience this scenario using devices as diverse as a Panasonic Toughbook H2 with embedded VZW LTE, the Sierra Wireless AirLink GX440 1101414, 1101413, 1101531, 1101530 and the CradlePoint IBR600-LE.
Currently, we have been informed by contacts Panasonic and Sierra Wireless that a firmware fix will be available for this issue at the end of November. VZW confirms that these devices are in their labs and that a November date is accurate for VZW to finish necessary testing.
After the new firmware is available, detailed instructions will be posted here to explain how the fix can be applied. It is strange that initial carrier certification testing did not expose this potential issue…