Wifi needs constant rebooting

Hello, It is the 15". When the WiFi is working, I see a list of several networks. When it stops working, it either stops entirely-I lose the "fan" that says I'm connected, or, it says I'm connected but the other networks disappear. Is this what you mean? Thank you.

@pamelaa57612 - I'm not quite sure what you've stated here. If the list is present but your WiFi AP is gone then the AP's location is to far or there are signal blockages between you and the AP.

It's also possible you're jumping between bands 2.4Ghz and 5.0Ghz. 2.4 offers more distance by less throughput, whereas 5.0 offers less distance, but more throughput!

You may need to get an extender to improve the signal. This maybe needed if you have competing AP's which are stealing your band space by over powering yours. There is a nice WiFi Sniffer App called WiFi Explorer in the App Store which will allow you to visually see the WiFi radio's.

I'm sorry, I wasn't clear. I stay connected to my AP, but suddenly it isn't actually connecting to the internet anymore until I turn wifi off and on again. Wifi works perfectly on several other devices, just not the Macbook. You had asked about other networks and I misunderstood. This is definitely not an issue of a weak or interfering networks.

@pamelaa57612 - OK, that helps a lot! So it's not the WiFi or even your WiFi adapter, and if other systems accessing the internet via this AP then it's not the AP or down stream either!

So... we need to look at what's happing within your system!

How much RAM does it have and how big a drive?

What is your Web Browser and are you accessing multiple Web pages in the top task bar?

What is your drive? HDD or SSD? How full is your drive? (Free Space)

16 gigs Ram, 33 gigs available of a 250 gig SSD. I mostly use Firefox with many tabs open, but also occasionally use Safari and Chrome. I should tell you that I am running ancient OS in order to preserve a couple of programs that will die if I upgrade: Sierra 10.12.6! However, this problem is new-it has worked with this software for years. Also, probably a separate issue, the battery (a replacement put in 3 years ago) has been dying for a while and is now dead-an X on the battery icon. I'm intending to get a replacement here, which is why I want to fix the WiFi at the same time if I can. Thanks!