Thanks for your reply.
I've actually solved the problem.
But when it first happened it coincided with the sub-zero cold spell we had in Chicago a few weeks ago & I too thought it might be due to the freezing temps. We've had some warm weather (40s) recently & I was disappointed to find that it didn't cure the problem.
Glad I Googled the problem & was surprised to find posts about it. Otherwise it would have been a trip to the dealer.
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