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Suggest the connector at the Throttle Body.
I have removed the connector on my bike, cleaned with contact cleaner and added Dielectric Grease to my connector. Oh did this as preventative maintenance, I have not had the problem but heard many complain about this connection point.
This is what it sounds like to me as well. That's where I'd start. Unplug this connector dry out well and dialectric grease.
If mine gets real bad I pressure wash it at the car wash ,have for years Ya just gotta watch where your wand goes.It maybe gets bad enough for that 3to4 times a year.never had problems.
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