How/where is this being used? Like in a stand alone house? or in a townhouse/appartment setting, or business setting where there are others close by? It could be possible to be something like interference from some other source.
Even within the house, could be some form of interference itself.
IE, my bathroom on the main floor is less that 15 ft from one of my pods here, and shows full bars. But there is my laundry room in between, big metal appliances as well as the plumbing for it, the bathroom, and the pipes going upstairs. All that leads to interference and some wifi issues in the room