It's probably a configuration or firmware issue rather than a hardware problem itself. Two weeks is pretty quick for a problem that's getting worse, so first thing: completely restart the box (unplug the power at the back for 30 seconds). Then check that you've got the latest firmware version by going into settings - that often fixes weird bugs like this one.
If it keeps happening, also look into possible interference - is there anything that could mess things up (microwave, cordless phone, other routers near you)? The 6 uses Wi-Fi 6 so normally it's more stable, but sometimes switching frequencies helps: try switching to the 5GHz band instead of 2.4GHz if you can. And honestly, if it's still going on after that, contact Orange directly - two weeks is within the period where you can get the box replaced if it's really acting up.