Mobile Link WIFI devices require connectivity to WIFI networks broadcasting on the 2.4 GHz network band. Many modern routers are beginning to offer "Mesh" network capabilities, which in some cases leverage a technology commonly referred to as "Band Steering."
"Band steering" is a technique used in dual-band Wi-Fi environments to encourage dual-band devices, such as most modern smartphones, tablets, laptops, and PCs, to use the less-congested, shorter range, and higher capacity 5GHz band, leaving the more crowded 2.4GHz band available for legacy clients which have both combability to 2.4Ghz and 5Ghz.
Unfortunately, some routers do not account for device types that only support 2.4GHz network environments by default and will attempt to force a 2.4GHz compatible device, to attempt to leverage the 5GHz band.
Fortunately, most router manufacturers offer instructions on how to address 2.4GHz compatible devices.