I like to tune to Double Drop D sometimes, but recently my high E has been breaking during the downtuning, twice with my Strat, and it just happened with my acoustic.

Is there something I can do to prevent this from happening?
Fender MIA Telecaster with DiMarzio noiseless single coils
-Fulltone OCD
-Ibanez Analog Delay
-Dunlop Crybaby Wah
Fender Blues Junior
Fender MIM Jazz Bass with Noiseless pickups
Mesa Walkabout
Epiphone AC200SCE Acoustic