We've been with Zen for 2-3 years on an FTTC 80/20 connection and have had little to no problems during this time.
About 3 weeks ago however we started having a problem with infuriatingly slow upload speeds (0.5-2mbps) on several testers, but it was almost unusable in reality.
Before this issue, we would consistently get 75/18~ Mbps and now we are getting 75/1~ Mbps. So the download speed is still completely fine but the upload is now extremely poor. I should note that when trying to run a speed test, the upload test takes 15-20 seconds before it even starts?No idea why.
We have tried changing everything our side of the test socket :
Factory resetting the modem router twice, updating the firmware, changing the filter, changing DSL Cable but to no avail.
Zen have suggested that one of our devices could be hogging the upload but they admit the line saturation is very low and we've tried connecting one computer at a time over ethernet and disabling WiFI. (Didn't make a difference when trying with several different machines, all fairly new.)
We thought it might be an issue with the supplied modem router (Fritzbox 3490) so we went out and bought a test modem/router and used that over ethernet but we have the exact same problem. So at this point, we are extremely confident it's not an issue our side of the test socket as we've isolated everything and switched it out for something else.
Our sync speeds are still completely fine (80000/20000) and Zen say there are no problems with the line tests they have run. They tried switching us to a different area on their backend (whatever that means) but it didn't help. At this point Zen says there is nothing else they can think of so they agree to send out an Openreach engineer to see if it's a problem with the line.
Guess what: The Openreach engineer arrived this morning and said there is absolutely nothing wrong with our line but is also satisfied it's not an issue our side of the test socket. He doesn't have a clue what's going on. He said he'll speak with our ISP..and am now waiting for more correspondence.
What is going on???
- Everything our side of test socket has been switched out/isolated.
- Zen says there are no line faults and sync speeds remain at 80000/20000
- Zen have tried moving us to a "different area on their backend"
- Engineer sent out by BT says there is nothing wrong with our line but also believes it's not an issue on our end.
Thanks for any input.
Edited by AstroflashTB (Thu 05-Sep-19 11:23:59)