You're not the only one. 5G has randomly become a problem for many. Disable smart optimisation for one in your settings. It helped make mine far less constant but still doesnt explain why its a random issue.
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Try a pinhole reset. Press the reset button for 20 seconds then release for 5 seconds, repeat this 3 times. Then wait for 10mins. Log into Hubs settings and go to Advanced > Wireless > Wireless signal - turn off optimisation and make sure on 2.4GHz 20/40 is selected and on 5GHz 20/40/80 is selected. Apply these changes. The network should show as 1 VM******* name and will choose 2.4 of 5GHz depending on device or distance from device. 5 is faster but doesn't travel as far, 2.4 is slower but is better over distance.
Smart optimisation makes automatic changes to channel and bandwidth.
Disabling leaves control to you. When it is enabled it can change ur channel itself if it wants to. This aint the end of the world because likely your device will change with it. However bandwidth can be difference between connection and no connection.
Imagine 20mhz as a flashlight. It can shine high beam a long way but only a small amount of light.
40mhz is a floodlight. It can send much more light but a short area covered.
So your device is connected may be connected at 20mhz but when it detects interference and changes to 40, objects further away get disconnected.
To see for your self and play around download wifi analyzer on your phone.