Happy Birthday to you There's no way your neighbour's Internet activities can impinge on your broadband/internet service - unless they are using your router password and "hi-jacking" your service. It is of course illegal.
I find this most unlikely, even if he does drive a BMW
We've gone over this ground many times. You have a persistent problem with your Internet access.
You could/should call in an "expert" to sort you out once and for all. Or, complain to BT.
You have a BT router box (which we established last time you posted the problem).
But who is your Broadband/Internet provider ?
Is it BT or another service like Virgin, Talk-Talk, Sky etc.
Broadband speed may well depend on just what service package you have with your provider.
One thing you can do is a Broadband speed test. Each provider has an online tester app.
Run some tests and take screen shots of the results.
You can use the screen shots to complain to your provider if the speed is way below what they advertise.
Some on here have advocated using a cable between your BT box and your laptop.
This eBay link shows the type of cable you need.
auction: #322216272146 Buy this cable.
I've selected one 5m long.
If you need a longer cable there are plenty to choose from.
Tis a "messy" solution as you'll have a cable trailing round the house and plugged into the back of your laptop - can make things a bit more awkward - but hard wiring to the internet should mean you don't get a dropped connection.
OK
I suspect you have a dodgy laptop.
How old is your laptop ?
What make/model ?
The WiFi module inside could be flaky.
Manufacturers are upgrading the WiFi modules inside laptops all the time - you could be stuck with something old hat and very slow compared to today's offerings.
It is possible to upgrade the WiFi module in some laptops, but this is for an expert and you need the whereforeall to dismantle the laptop.
Get the cable and see how it goes with that .....