My iPad 2 has a hard time locating our Wi-Fi network at home. About once a day it will find it and connect but only for an hour or so. It's not like I'm getting a "can't connect error", it just doesn't see the network. It seems to have no problem connecting to networks outside the house (coffee shops etc). Also, all of our other devices have no problem connecting to our home Wi-Fi.
I had the same problem with my iPhone a fews ago. Please reboot the router first. If this didn't work, then reset the router to factory resettings.
First you should download a wifi signal strength analyzer app, so you can rule out having bad wifi. A quick google search let me find this app https://itunes.apple.com/us/app/wi-fi-sweetspots/id855457383?mt=8. Please post these results.
If you have good signal, then I'd try the steps from this article. Particularly:
- restarting the I-pad
- removing and re-adding the network to your saved wifi networks
- delete other (nearby) networks so that the I-pad isn't trying to connect to them instead of yours
Also see this article on how to set up your wifi most effectively.
I suggest that you contact your internet provider. It may be that the signal is weak or that when you are using your iPad you are using it in a 'dead zone' or part of the house where the signal is weak. There are apps which let you see exactly where 'good' and 'bad' reception areas are in your house but I would contact your provider first.
There could be a problem with the SSID interpreter on your iPad.
Try to manually connect to see it that works.
For this use your Terminal and copy paste following:
1- Turn On (if it is on you can skip this)
networksetup -setairportpower en0 on
2- Find the Networks (see it this shows it)
3- Connect (by replacing the SSID and provide the password)
networksetup -setairportnetwork en0 WIFI_SSID_I_WANT_TO_JOIN WIFI_PASSWORD
The Scan result should look something like this:
The SSID is human readable name
The BSSID is the computer readable name for that interface.
Comcast also provides some instructions here: https://customer.comcast.com/help-and-support/internet/wireless-gateway-username-and-password/