Had exactly the same problem with my r before xmas.
Several days of riding in bitterly cold freezing fog and extreme cold and general damp murkiness.

The solution; (preferably somewhere warm and dry)
take your tank off to reveal the bulk of the loom and then work your way through takeing every single plug you can find apart and spray inside with wd 40 or similar to get out any moisture before reconnecting. Do the same with all the plugs to the relays etc behind your side panels as well.
She'll run sweet as a nut then I'm sure.

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I'm always in the sh1t, only the depth varies