Wifi network listing freezes on Nexus 4 after Lollipop update

Question

I have a Nexus 4, and finally decided yesterday to update to Android 5.0, after being fearful of bug reports. And wouldn't you know it, I've found a nasty bug.

Nearly every time I try to display the list of Wifi networks in the Settings, the system freezes for about a minute, then I get prompted saying

Settings isn't responding.
Do you want to close it?
REPORT WAIT OK

If I wait long enough (by hitting 'wait' or 'report'), then I eventually get the list of wifi networks, and everything appears to work normally* from that point.

If it's relevant, my phone also has the problem described in this question, and the update to Lollipop didn't fix it. So I'm thinking a factory reset may be in order....

_{*I say normally, I had to wait a similar amount of time to authenticate to the network at Starbucks through the authentication web site, but once I was authenticated, everything appeared to work normally. I have no idea if this is actually a related problem, so I only mention it in passing.}

Answer 1

I had this problem recently and solved it by removing old saved networks in the WiFi settings. I found that there were a huge number of networks with names that were strings of letters and numbers.

1. To remove saved networks open 'Settings' and choose 'Wi-Fi' (and wait for it to load).

2. From the 3-dot menu choose 'Saved networks'.

3. You should see a list of networks in a similar format to those shown below:

4. Remove any you don't recognise (tap the network name and tap 'Forget'):

Once all of the unrecognised names have been removed the list of WiFi networks should load without freezing the system.

NOTE: I have found that this can occur again after a while, in which case repeat the steps above.