In my experience Les it is always this time of year when the "oomph" goes out of life in general including things photographic. Resilience can be at a low ebb.
Some bloke from Yorkshire or was that the House of York used to speak of a winter of discontent. He might have been nasty but he was also astute
So you are not alone if that is any consolation and it will pass just as the winter passes.
Mike