Why does my Wi-Fi sometimes say no internet after sleep?

Since other devices stay online and a restart clears it, start with the laptop’s Wi-Fi adapter rather than the router. In Device Manager, open the wireless adapter’s properties and look for a power-management option that lets Windows turn it off to save power. If that option is present, try disabling it, then test whether the problem returns after sleep.

Check whether the connection is actually failing or just Windows’ status indicator. When it happens, try opening a website and, if you’re comfortable with Command Prompt, run ipconfig to inspect the adapter’s address and default gateway. If the gateway is missing or the address looks invalid, that points toward a local connection or DHCP issue. If those look normal, the internet-status detection itself may be misleading.

I’d check for an updated Wi-Fi driver from the laptop maker or the adapter maker, especially if this began recently. Also look at Windows Update history for a driver change around the same time. Avoid changing several things at once. Update or roll back one driver, then see whether sleep and wake behave differently.

If the simpler checks don’t help, a network reset may be worth trying. The commands for renewing the network address, clearing DNS, and resetting Winsock or the IP stack target different parts of networking, but they can also reset settings. Try the adapter power and driver checks first, and make sure you know how to reconnect to your network before doing a reset.

Because it happens after both sleep and shutdown, I wouldn’t assume sleep power saving is the only cause. When it fails, see whether turning the adapter off and back on in Windows restores internet without a full reboot. That result can help separate an adapter recovery problem from a broader Windows network configuration issue.