Only one session at a time is allowed
Common issue as have seen this on lots of other posts.I have had several disconnections of my internet in recent times, and although work was recently carried out in my area, have still experiences the same issues two day after.
If this doesn't resolve itself, I will raise an issue with VM directly.
That aside, because of those issues, I have pin reset 3 times now, and still cannot log in to my router, which when doing so, says
"Please note!
Someone else is currently logged into the settings page. Only one session at a time is allowed. Please try again later."
You need to reset the router exactly as below.
Keep the hub switched on and disconnect any ethernet connections, then push the reset button firmly with a paperclip or something similar and keep it pressed in for a full minute.
Wait around 10 minutes and it should revert to factory settings. You can now reconnect the ethernet cables.
If you previously changed your router password it won't work and you will have to use the one printed on the sticker on the router. You can always change it again by going into the settings