No internet connection

I have the highest Internet I can get with my provider right now, which is 100 Mbps. Though every time Im on Mercari, I dont have a proper Internet connection. The app was fine before the latest update, so Id like to know how they managed to mess that up. Love the shopping and low prices, well when I can shop because, like I said, the app doesnt work half of the time!

ColorFanatic91 about Mercari: Buying & Selling App