One computer on home network keeps dropping off [View all]

I don't have all the technical specs, but here's the gist:

My wife's Lenovo laptop is the newest (4 months) computer in the house. We recently (2 months) upgraded our internet thru Comcast, and the service has been stable and consistent.

Starting yesterday, her laptop starting sporadically losing connection to our home network and each time is unable to reconnect for a while after. During these blips her computer auto-connects to our neighbor's wifi just fine (he gave us his password) but will not reconnect to our own, despite a much stronger home signal.

I held my phone a few inches above her laptop and was able to connect to our home network. Also, her laptop sees the network but can't connect to it, and she's using the correct password, since she's sometimes able to connect. She's rebooted several times without change. From all of this I infer that the problem is not her laptop's wifi receiver, but where does that leave us?

My younger son's laptop did this once yesterday, at the same time as my wife's, but it hasn't happened to him since then.

No other devices in the home are showing this problem, and for that matter my wife's laptop is the closest device to the modem (about 8 feet).

I'm not averse to calling Comcast about it, but I wanted to see if there's something I should try on this end first. I haven't yet rebooted the modem, since all other devices are connecting with no problems.

If I do call Comcast, should I describe the problem in some way beyond what I've stated above?


Thanks for any help.