If your handy with a multimeter connect it to your battery while the engine is off and check the voltage at rest should be around the 12v mark. Then start the engine and hold it around the 3-5000 rpm mark and check the voltage in your battery it should be charging around the high 13's or 14v mark. Anything lower than about 13.5 then your regulator is probably suspect and you will need to either test that with a multimeter and or find one that is known to work and change it out with yours.
If your battery is less than 12v at rest then it is possible that your battery is degrading and needs to be changed out. If it is the battery and you can afford it opt for an AGM battery AGM=Absorbed Glass Matting. They are a sealed unit and are better than the standard unit.
This does sound like an electrical problem but it is hard to say if it is the alternator itself that is causing this.
I would look into having it tested and if it isn't the problem then it could be one of your relays.
A few things to check....is the battery still charged when the bike dies, if so the alternator will likely be ok......check all cables and wires (especially the ground) to be sure of tight clean connections.
Try those things and see if it helps
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