Hi Nikita0133,
I hope you don't mind me asking but how many boxes do you have in the home? I've been into the TV services and whilst I've not been able to see anything outright with an issue, I was able to see that the broadband isn't showing the right level on the upstreams power levels.
I would like to send out an engineer as this would need to be looked into and the TV services can have a look over whilst in the process 
I've sent you a 'Private Message', you can find this by clicking on the little purple envelope near the top right of the page.
Stay in touch and have a great day.
Ben