I am using AC1750 dual band router which has the latest firmware.

Recently, the wifi from this router dropped a device randomly, today it's this device and romorrow it can be another. While this happening, the affected device couldn't get on internet but all other devices connected via wifi or ethernet cable had no problem using internet. The traceroute command would fail on the affected device but showed quick normal response on other devices. A reboot on the router will solve the problem. But it happened too frequently and became annoying. It's certain the problem resdies on the router, not on a particular device.