Internet down for days now

[Dazzar]

The speed of three internet has been at 4mbps instead of my usual 400mbps what on earth is wrong, they can’t say mast as other postcodes in the same down and further away state no problems 

[Alex]

I had the same problem here.  Since day one when I check on the network status by postcode there is the message of "We are working on a masts nearby" However since last week I had bad issue and being most of the time in 4g at 3mb. I have contacted customer service, they have reset my config and asked me to reset the router. It came back to normal today. Maybe try to reset your router. There was also firmware update from 13 to 14 at some point so maybe this has affected the signal. 

[HampshireBaz]

I have had performance issues over the past few days and have just changed the APN settings to three.co.uk and disabled ipv6 and I now have stable Internet with normal speed.  Perhaps try that?