Zombie Highway game freezing

[Memememe]

I have been playing the auxbrain game "Zombie Highway" for a while on my Galaxy s4. Great game, but, after a dozen or so hours of play it slows, stops, and then freezes, totally. I have tried stopping, restarting the phone, and anything else I can think of, but the only thing that restores the app is to delete the user data, which returns the game to zero. All of my victories against the nefarious zombie menace comes to naught.

I have emailed the company, but no reply. I have searched fora, but no answer. So here I am. Is there a way to correct this problem and waste more time killing zombies?