If the internet connection goes down, this typically is due to a bandwidth or mitigation problem. It may be that one of the devices may not be able to handle the bandwidth or there’s a mitigation problem, in which this step may help to try adjusting some settings on the router.
Check for the following settings in the router and disable any that are enabled:
• QoS (Quality of Service)
• WMM (Wireless Multimedia)
• UPnP (Universal Plug and Play)
The settings for these can vary from depending on the device model. It’s not something that we help with directly because the settings and locations can vary. The router manufacturer or Internet Service Provider (if the router/modem was provided by them) can help look for these settings.
If you continue to experience issues, please include the WinMTR test requested.
Also as a side note, the Blizzard Application uses Bytes (MB/s), while the 250 mbps mentioned is in bits. Bytes is a unit of memory or storage that contains 8 bits. So 18-22MB/s that you see on the application is actually up to 176mbps.