Sky Broadband (Sagem) Connection Dropping

I've had my Sagem router running sky broadband for about 7 or more months now, but yesterday the connection began to drop randomly after connecting for like 40 seconds. Then It will come back on again 1-2mins later,they asked me unscrew my phone line covers to check yo see if it was a direct line. Eventually they told me that they would pass the issue onto their experts and would contact me in 72 hours, however after reading the exact issue that someone else had and he didn't receive any contact.

- My desktop is connected via Ethernet and I have 2 laptops which also cannot connect to the Router.

- I don't recall any changes I've made to the network, that might have caused these problems