Good point, would need an alarm guy to confirm or otherwise.
Assuming that the fault is not caused by loose connection or chaffed wire my further thoughts are these: In my experience flasher relays fail. Switches wear and develop intermittent faults before failing. Your switch is 19 years old, so it has to be the prime suspect and is where I would start, but like all electronic/electrical faults - you never cease to be surprised.
Good luck with it.
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2015 Brutale 800RR