My wife has a 2018 Macbook Pro 13″. She uses the machine to teach classes over Zoom in our living room and has been having intermittent internet speed issues over the past couple of months that result in really choppy zoom sessions that make it almost impossible to teach her classes. We have VERY fast internet (900mbps up and down) and a three point mesh wifi system (more on that below).
Some days when she does a speed test, the speed is as expected. Other days, in the exact same spot, the speed crawls to 0.5mpbs up and down (or less). Placing a different Macbook (2012 Air) in the exact same spot at the same time leads to expected speeds. Testing our iPhones in the same spot leads to expected speeds. In addition, this is intermittent. At 10am her internet speed might be crawling, but 20 minutes later (in the same exact spot) it could be fine.
Wifi setup: we have our main Google Home router at the opposite end of the house from the living room, where my wife is trying to use the wifi. We have an additional Google Home router located halfway through the house connected via wifi, and an additional Google Home point located in the living room, also connected via wifi. No other devices have internet speed issues at all, except for her laptop.
Any ideas of things we can try? Might this be a Macbook hardware problem of some sort?