connecting amd disconnecting xfinitywifi

so i have an account with xfinity that allows the xfinity hot spot i use the xfinity hot spot at my trailer and my modem is at my brothers house. everything worked beautofully till a couple days ago where i couldnt even connect to the network than after 40 mins of it saying network selection rejection dhcp than it would onnect for a coupme of mins than disconnect me. now heres the woerd thing if i walk up the street a little i would connect automatically perfectly same hotspot but wen i go bk to my trailer i get disconnected and that message pops up saying it cant find my ip adress i need help bad