Nostalrius Begins - Quality wow vanilla realm (1.12)

Hi there, I have 4 computers running on my IP all with seperate users. Recently Ive been disconnected alot when grouping with my room mates. I was wondering what was needed on my end to fix such issues. Today I was disconnected from PvP and recieved deserter for the 5th time. I know it is not my connection being that we have top of the line fiberoptic internet. Please write me back with some instruction on what I can do to fix this. We just want to group up and enjoy PvP!