It's not a bandwidth thing; however bandwidth can degrade with distance to the signal. Wireless networking is susceptible to many different forms of interference. The neighbor's wifi on the same channel (or one that's too close.) Cordless phone handsets. Cell phones. Microwave ovens. All other forms of radio that might just have a harmonic on the same frequency. Sunspots, too, lol.
Casual computing probably wouldn't show these issues. It's likely that watching a movie on Netflix doesn't show it either due to the fairly large look-ahead buffer it uses. Games? Not so much.
At least, if you're using wifi, use a smartphone wifi analyzer app to determine what channel people around you are on, then set your own wireless router to avoid them. Like this screenshot I just took on my phone of the 2.4GHz band. I'm on Channel 11. The default is usually Ch6, and my tenant is on Ch1. Note the severe channel overlap. If you don't have access to a smartphone app, at least set your router to a different channel than the default channel. And if you have a 5GHz capable router, use it. It doesn't go as far, but it can be faster and more reliable. The 5GHz band is not as congested as the 2.4GHz band.