The New Game in town:
3month Yield vs. S&P 500 dividend yield
The United States 3 Month Bill Yield is now sitting at ca. 1.92%. This is a tiny difference to the current S&P 500 dividend yield, which is also hovering around 1.9%. Therefore you could sail the potential tricky summer period...
...along with your US-3month bills and come back in September (2018) or even only in Q4-2018 altogether.
At least you are then sure to avoid potential hickups in the stock market during the summer months via this strategy. Let's see what the big "boys" are doing...