Where can I get a new Wi-Fi/BT Dongle for my RS-150B?

I think my Wi-Fi/BT dongle is going bad since my network connection to my RS-150B is acting very slow, and drops out. When it drops I get a “No Network” message. When I move my i-pad closer to the 150B it connects. Where can I get an replacement? My unit is 4 years old. It’s been serviced once by MoFi in Vegas,NV. They replaced Dongle under my warranty. My warranty ran out in April 2026. Thanks.