Be so kind as to drop power to your router for min of 30 mins then re-power on and do a line speed test again. Also please quote your router type / name.
The power off and on will create a new profile for your service at local cabinet. With any luck that should resolve your issue.
I'm sorry to hear this. I've run a test on the line which has detected a possible fault and the connection also looks very unstable. Just to confirm, are you experiencing any issues with the voice service such as noise on the line or no dial tone? If the voice service is ok then please let us know and we will raise this to Openreach as a broadband fault.
Thank you for confirming. I've passed this over to Openreach now to complete an external line investigation. If you don't hear anymore over the next 48hrs then please let us know and we can re-check for an update on the fault for you.