Run the check
Record the time and whether all keys stop together.
Check the operating system's device connection status during the dropout.
Compare direct USB with a hub, or a charged wireless connection with the original.
Read the result
A simultaneous loss of all keys and a system reconnect points to the connection path.
Limits and next step
A web page cannot read USB enumeration or radio signal strength.
Repeat the check after changing one setting or connection. Keep a record of what changed before deciding whether the device needs service.