Quite a strange scenario on a new line where I'm seeing loads of packet loss and very poor upload speeds (0.5Mb). Openreach have been out 4 times and cabling has now been replaced from mast socket all the way back to junction box before Cab. What's very strange though is that each time a piece of cable has been replaced the fault disappears - BT tests show no errors and line syncs at 40/10. About an hour after the engineers have gone the DSL drops, router re-syncs and upload drops to 0.5Mb and when a test is run all the CRCs are back.
Anyone seen this sort of issue before?