Internet key not always detected by the operating system

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http://askubuntu.com – I've over the time, tried and installed several versions of Ubuntu . Those versions I like more than others are: Lubuntu and Kubuntu. Everything seems to work properly but the internet key. I do not know if it may depends on the weather, the moonphase or the tides but the internet key is not always detected by the system and is sometimes very difficult to establish a connection when i do need to connect to internet . Without applyng any change sometimes works sometimes not. I've so far not found the solution and i think is a quite strange behaviour of the operating system as if the settings (HowTos)