Moved home, lag spikes, dropping connection, fibre

Hi to everyone, 

I have been Talk Talk customer for few years now. We used to live in the Town Centre and were having normal broadband. Now we ve moved to another place, brought our broadband with us and upgraded it to top fibre optic. 

For last few weeks I have been experiencing huge lag spikes and connection drops over WLAN and LAN. 

When I am connected to certain programs, voice chat etc. They are usually 40-50ms and in few secs jump to 5000ms and further. Then all come back to normal.