Cycle race track lap counter

Hmm, I just ran this on an MDBT42Q:

setWatch(function() {
  require("Storage").write('laps', [8], 0, 16001);
}, BTN, {repeat:true});

and it works absolutely fine, so I feel like there's something else going on... Any chance you could try taking stuff out of your code until you're left with a minimal example that always exhibits the problem? Then I can reproduce here and get a fix in.