yes facing same issues the whole software is bugged like anything......nokia really needs to push an update so that these kind of issues get fixed.
I'm finding wifi speeds on my N7P running 8.1 and the July update poor compared to all of the other devices that I have around.
It's particularly noticable when the wifi signal is marginal. Compared to an old Galaxy S5 I have around the Nokia gets 10mbps whereas the S5 gets 30mbps.
On 5Ghz when the signal is marginal the S5 will get 40mbps and the N7P won't even see the network or if it does it'll often drop it.