Inspiron 355 loses wireless connection repeatedly

I have a new Win10 Inspiron 355 that repeatedly loses internet connection while on wireless. The wireless icon in the system tray shows that it's still connected to the wireless network, but no internet access. The fix is to disconnect then immediately reconnect. But this gets tiresome to do every few minutes. (I did it 3 times while writing this.) I do not have McAfee or any third party firewall/security software--just Windows Defender. I had 3 other laptops and several mobile devices in the house, so I know the wireless works.

Here's what I have tried:

1. Run the Windows network troubleshooter
2. Upgraded the wireless adapter driver
3. Deactivated Power Management in the wireless adapter
4. Deleted the wireless connection, rediscovered it, and created a new connection
5. Did a hard reset on the wireless router
6. Flushed DNS, released and renewed ipconfig

Any advice appreciated.