RageSaul
lets reprise what Xanda Man said in post #6
"
I'm going to make an assumption here that the problem hasn't been properly troubleshooted/diagnosed in the first place? If it has I apologise but most of the time people live with these issues and tend to complain rather fix things (our wonderful British ways ) Yes you have changed the router but there could be many other factors that are causing the problem To change ISP as a resolution is a bit drastic IMO.
If there is a physical fault with the line then the problem will just follow to your new ISP and all the hassle of changing will have been pointless!
So first things first - the basics:
1. - Check your phone socket has a broadband/PSTN splitter plugged in and that the cable from your router is plugged directly into this and that the filter is plugged directly to the socket. Try getting a new one, you can get them from 99p stores now-a-days.
2 - The big question... Are you 100% sure that your line is dropping?? Or are you wirelessly connected and it loses the signal? Do all devices that are connected have the same issue? Do some digging with this one it would help diagnose the issue, it could just be a wireless issue and few tweaks to your router could really sort things out as it could be conflicting with other routers locally.
If you are certain that your line is dropping then speak to your ISP. It is their duty to supply your service and they have the relevant tools and means to be able to investigate properly! They can diagnose any faults and easily rectify (with the help of my previous employer) anything that they find.
But like I said, first things first, diagnose the issue - Is it the line dropping or the wireless dropping? If you line drops then depending on your model of router the DSL should either be flashing or off/red. If you can supply the router model I can tell you."
Your simple response was "I've done all that"
Have you? Really?
Have to spoken to the ISP and asked them? What do they say?
Theres no more help coming your way I suspect until you clarify things