Great post. New to here and its the first post I've seen of yours. Brilliant stuff!!

I guess there are going to be many different interpretations of what a funk actually is...

It doesn't help when autocorrect tries to change funk to fu*k. But anyway...

I believe the problem starts when you do not have a goal in life. By this I mean an end goal of where you would like to get too.

It is hard to get in a funk if your goal is always in the back of your mind pushing and striving you forwards in life.
To reach your end goal there are always mini goals. These may be daily, weekly, yearly etc. By having these it is harder to get in a funk as you are always thinking, working towards, and aiming for your goal.

If the time comes your funk beats you down and you are struggling.
The end goal is always in your mind. It will win and pull you in the correct direction and get you out the funk.

On another note. This is the main problem of retirement. People work their whole lives with the end goal of a happy, peaceful retirement.
The time comes to retire and they just sit around doing nothing all day every day.
As there are no goals anymore. The body has nothing to live for and just gives up.
You get weaker and illnesses start to kick in.
This has happened to many people I know.

-Don't get in a funk.
-Keep them goals and targets for whatever happens in life.
-If you get in a funk, go back to your core goals and set mini goals to help you out of the funk.

Thanks.
Have a lovely day. :)