Is your hotspot close to your node so you are receiving a strong WiFi signal.? The all metal Unistorm case will attenute the WiFI signal some.? It should be fine if you are close to your hotspot because the case is leaky because there is not metal to metal contact at the seams due to the black powdercoat paint being non-conductive.
Also, can you try using a 5 GHz WiFi connection?
Steve-N8AR