Magic Mouse 2 Bluetooth Interference (LAGGING)

I have been experiencing severe lagging from my Magic Mouse 2 for several months now and at times it is so bad I am totally unable to use my iMac. I live in a townhouse and have figured out that my neighbor has a bluetooth device that is causing the issue.

When the neighbors device (amazonbasics210) is not pared is when I experience the issue. It is some sort of wireless speaker; I know this for sure because I can connect to it and blast music that I can hear from my home. I believe it to be one of those portable speakers designed to connect to your phone. When it is pared to one of his devices, my mouse operates as normal. When I pair my computer to his speaker my mouse again operates as normal. It is when his bluetooth speaker is powered on and not paired that I experience the issue. Unfortunately, it seems this is always the case.

I am not sure how to resolve this issue and it has gotten VERY annoying. I pair my computer to it whenever possible and then switch my audio output back to internal speakers. This is the ONLY solution I have found. Every time he uses his speaker and then disconnects from it , I have to go through the above process again. I will also lose connection to it every now and again and have to re-pair with the device.

Anyone have an idea how to solve this issue?