Running low on memory

Thanks! If you turn on logging in the IDE (settings -> general -> terminal log icon, then click the new icon) then paste the following code:

(function() {
  var addr = 0x60000000;
  var len = 1024*1024*4;
  var f = require("Flash");
  function log() {
    var l = 32, d = f.read(l,addr).slice();
    if (!d.every(x=>x==255)) print(
      addr.toString(16).padStart(8,2),
      d.map(x=>x.toString(16).padStart(2,0)).join(" ")
    );
    addr += l;
    len -= l;
    if (len>0) setTimeout(log, 2);
    else print("Finished!");
  }
  log();
})();

it'll dump out the full contents of flash memory (it'll take a while!) and I could then copy that data onto my device and try and figure out what went wrong. Although it's not guaranteed I'll be able to find the issue from that - finding a way to reproduce it reliably and quickly is much more likely to lead to a fix