If your hardware does support Modern Standby, you can force the system to maintain network connectivity using the Local Group Policy Editor. You will need to navigate through Computer Configuration, Administrative Templates, System, Power Management, and finally Sleep Settings. Inside this directory, locate and enable the policies named Allow network connectivity during connected-standby for both the plugged-in and battery states. If you are using a Home edition of Windows without access to group policies, you can achieve the exact same result by modifying the registry. You would navigate to HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Power\PowerSettings\f15576e8-98b7-4186-b944-eafa664402d9 and set the ACSettingIndex and DCSettingIndex values to one.
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Domic V.