It is highly recommended to disable wireless devices while running Cubase.
Here is a good utility to run …
http://www.thesycon.de/deu/latency_check.shtml
… it will show you if you have any spikes going on in the background causing interruptions.
Also, you might find some other useful info here …
The Steinberg Forum Knowledgebase for Users by Users
Steinberg Lounge
Welcome to the Steinberg Forum Knowledgebase. The learning curve is steep. The manual is boring. How can one integrate all his different equipment into a unified, intuitive music making machine? This is why Bassbase and I built this...