I had this issue and I found a fix for me. So I read so forums and found that some said that the Bluetooth could be interrupting the WiFi signal. I have a GHz and a 5 GHz connection on my router for my WiFi. I changed my connection to the GHz frequency on my router with my tablet. I always use a Bluetooth device because I have the Logitech Folio Bluetooth keyboard for the tablet. Since I change my WiFi connection to the GHz frequency I haven't had a drop since.