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The problem often is that the key is loosing the wireless connection to the antennae that surrounds the ignition lock, causing the immobilizer to prevent starting the bike. The signal to the antennae can be weakened by installing an aftermarket carbon fiber key guard or by water infusion that can occur during washing the bike or from a heavy rain. Aftermarket key guards may not be as effective in keeping water out. Drying it out with a hair dryer may resolve the problem.
If you lift the OEM plastic shroud, the antennae is clipped in there. Have a look along the mould line of the plastic ring for green (copper oxide) residue, if there is any, replace it.