nothing to do with next door or should not be - you should both have your own connection back to the cab
whats dropping the connection or just wifi
as to the wall box and long cable - again that should not cause problems but if connections are loose or cable is damaged it might- start with some info and see what that says
log into hub3 - 192.168.0.1 [or 192.168.100.1 if in modem mode] - DON'T SIGN IN, click - click router status [centre of screen] - and post the downstream and upstream figures - to see those press on the grey buttons/boxes labelled - upstream - downstream
if its an earlier hub button is top right
as to the wall box hanging off the wall thats not ideal and VM should book a tech to sort it - they may want to charge you £25 for a non fault call out but wait for staff here who should [hopefully] sort it FOC
in the mean time post the info from the hub
____________________
Tony.
Sacked VIP