FYI: Should anyone be experiencing wifi issues.
My wifi connection had been playing up for about the last month, the connection to my wifi modem (Netgear DGND3700v2) had been dropping out randomly, but normally managing to reconnect itself, though more recently I had to turn on aeroplane mode and turn off to get it connected again. Also I think the connection strength was a bar lower, in general.
But since I flashed nightly of 0816 it has been unusable. I had been on CPD1 baseband.
I therefore flashed the newer CPE1 modem (though I was not sure if this would fix wifi) and it has been rock steady with a higher signal level for over an hour, so appears to be fixed!
Thanks again
@Redyamesg
edit: after going out it has dropped the connection and struggled to connect, one time, so not entirely fixed but is much much better. PS channels are not to crowded, will have to investigate further
edit 2: seems there was maybe some interference on the channel I was on as since changing channel there has been no loss of signal

Oh well at least it made me update to latest modem!
Edit 3: nope it's still not connecting automatically as well as it used to, have to do it manually, with a bit of luck there will be a new modem in Italian firmware below that will work better with latest CM13 nightlies!