Cannot download large StorageFiles [Resolved]

My Python script to download StorageFiles seems to have gone bust completely. It now times out waiting for first byte. I changed the previous timeout from 10 seconds to upto 30 seconds and it still didn't kick off. In the last attempt I got this in the file instead of actual data.

Execution Interrupted
at line 2 col 21
  line = f.readLine();
                    ^
New interpreter error: MEMORY_BUSY

The command sent to the Bangle (via Python/Bleak) is

getFileCommand = b"\x03\x10\
var f = require('Storage').open('ftclog', 'r');\n\x10\
var line = '';\n\x10\
while ((line != null && line != undefined) && (line.indexOf('\xFF') == -1)){\n\x10\
  line = f.readLine();\n\x10\
  print(line);\n\x10\
}\n\x10\
"

I also tried using the WebIDE and got similar error. At the time I wasn't sure if it was because I had initiated another connect on a different browser tab.

getFileCommand = b"\x03\x10\
var f = require('Storage').open('ftclog', 'r');\n\x10\
var line = '';\n\x10\
while ((line != null && line != undefined) && (line.indexOf('\xFF') == -1)){\n\x10\
  line = f.readLine();\n\x10\
  print(line);\n\x10\
}\n\x10\
"

In the WebIDE, atleast it spent good 10 minutes downloading the blurb before failing.

I will try with a longer timeout in the evening in my script.

Firmware details:

{
  VERSION: "2v04.375",
  GIT_COMMIT: "9b362663",
  BOARD: "BANGLEJS",
  FLASH: 524288, SPIFLASH: 4194304, STORAGE: 4194304, RAM: 65536,
  SERIAL: "a0cf0da6-7b6c234d",
  CONSOLE: "Bluetooth",
  MODULES: "Flash,Storage,hea" ... "le,graphical_menu",
  EXPTR: 536883676 
}

P.S. This may not be related to the firmware refactor. I started having this issue on Friday when I was running 2v04.99

Full Python script on Github