NEW high speed mobile internet masts may be causing havoc with your television set.

New fourth generation mobile services, known as 4G, have been switched on in Tywyn and Penrhyndeudraeth.

4G gives people faster access to the internet on smartphones and tablets.

However, there is a chance that some 4G mobile signals transmitted at 800 MHz will cause interference to Freeview, which is TV received via an aerial.

Because 4G at 800 MHz signals sit next to the frequencies used by Freeview, they can overload the receivers in TVs and set-top boxes causing interference.

Signs of interference are loss of sound, pictures going blocky, freezing or the TV screen going blank or showing a ‘No Signal’ message.

Fortunately help is available. Set-up under government direction, a company called at800 offers free support to households that rely on Freeview for their TV to resolve 4G-related interference problems so that viewers in Tywyn and Penrhyndeudraeth can keep enjoying their favourite programmes.

With more 4G masts due to go live, any viewers who experience new interference to Freeview should contact at800 on 0808 13 13 800.