Gixxer was talking about blowing fuses. From my experience that's a slightly different symptom than reg/rectifier problems which usually result in a flat or fried battery so you can't start the bike when you stop.
My guess here is check for a short somewhere - chaffed wires in the loom up front or something faulty in the ignition switch. Especially if its happening on acceleration or changing gear when things are getting moved about.
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