Chance are if you own a Macbook, you've had periodic WiFi connection problems. When we had problems I found lots of other people online with the same experience. The problem was, there are so many flavors of WiFI problems and a dizzying array of solutions - many of them scary technical. I don't want to be the guy that tries to fix the problem, only to make it worse.
The funny thing is, after many years of struggling with this, the best solution I've found is actually an EZPZ one. So I would humbly suggest if you are having problems, try this first.
It's easy, requires no money, and takes all of 1 minute or so. And now, without further ado:
EZPZ Macbook WiFi Connection Problem Solution
Step 1. Turn off your laptop
Step 2. Turn off your cable modem
Step 3. Turn off your Wifi router
Step 4. Turn on your cable modem, wait for the green lights
Step 5. Turn on your Wifi router
Step 6. Turn on your laptop
Step 7. Check your connection and hopefully, enjoy a solid and stable signal again.
I hope this works for you, too!