Diagnosis
The most common cause for this specific issue on the Hisense U8K is a software conflict in the TV's network stack, often related to power-saving features or DHCP lease renewal. While hardware failure is possible, the pattern of disconnects that resolve with a reboot points to a software or configuration glitch. Interference from the TV's internal electronics can also disrupt the built-in Wi-Fi antenna.
How to Fix It
First, perform a full network reset on the TV.
- Go to Settings > Network > Network Status and select 'Forget Network' for your Wi-Fi.
- Unplug your TV and router from power for two full minutes.
- Plug the router back in, let it fully boot, then power on the TV.
- Reconnect to your network, but during setup, manually select the 2.4GHz band (e.g., "YourNetwork_2G"). It has better range and wall penetration than 5GHz, reducing drops.
- Finally, go to Settings > Device Preferences > About > Restart to soft-reboot the TV.
If That Didn't Work
The next step is to isolate the cause.
- Test with Ethernet: Connect the TV directly to your router using a cable. If the connection is perfectly stable, the TV's internal Wi-Fi hardware or drivers are the likely culprit.
- Change DNS & IP Settings: On the TV, go to Settings > Network > [Your Network] > Advanced. Change 'IP settings' from DHCP to Static. Manually enter an IP address on your network (e.g., 192.168.1.150) and set DNS 1 to 8.8.8.8 and DNS 2 to 8.8.4.4 (Google's reliable servers). This prevents DHCP-related disconnects.
- Factory Reset: As a last resort before a service call, perform a Settings > Device Preferences > Reset > Factory Data Reset. This clears any corrupted software data causing the issue.
Heads Up
If the problem persists only on Wi-Fi after a factory reset, the Wi-Fi module itself may be failing, especially if it overheats. In this case, contact Hisense support, as the module may need professional repair or replacement under warranty. Using Ethernet is the most reliable permanent solution.