
I’m not a tech person just someone who has a wireless network. From what you say I would look at changing the channel your network is using. Failing that I would work backwards by connecting your modem direct to your laptop then work out so you can confirm the connections.
Check the channel first,,, have you got a new mobile phone, house phone or it could be your neighbours causing the problem for you or lastly your unit has gone US.
Hope this helps if not post back and a real tech person will help