No wifi on activation day

[MedC86]

Earlier this morning I set up and connected my router. It worked fine for around 10 mins or so, but has since stopped. The new white router has a solid white light, suggesting there is an internet connection. However, the router itself is no longer discoverable on any device. 

Can anyone please help?

[Tbicknell]

Also have same problem. Been off since late last night