Cannot connect to Volumio

I have an Audio359 Raspberry Pi B+ with HifiBerry DAC+.
It has been performing well.
However, I kept losing wifi connection; most likely macbook air os x. So upgraded my router ( tplink c3150 ) to see if beam forming would assist.
Now I cannot see volumio; neither wirelessly or via ethernet.
I have connected via ethernet and can play music; but wireless is totally dead.
New router 2.4ghz is the same name and password as before.

Any advice?

thanks Colin

please check this and report if it solves your issue.

These 2 sentences are a bit confusing: does Volumio work on ethernet or not?

Can you try with a brand new image?