I have the M600 package, but recently it has been running at only around 450mbs. It can slowly crawl up to 500+ but generally is very slow. This is on a PC and a Laptop both of which have seen over 650mbs previously. It has now been like this for several weeks. There was some work done in the area a number of weeks ago and it has been slow since really.
Thank you for your post. I'm sorry to hear you've been having some problems with your connection over the past few weeks.
I've been able to locate your account and can see that your hub's uptime is quite high which can cause issues with your connection. I know it seems basic, but can you please reboot your hub, remembering to leave the hub switched off at the wall for at least 30 seconds before turning back on?
Let me know how that goes and if you need any more help.