bangle.js 2 firmware install failure

I've just had a similar experience using both the nRF Toolbox on Android/Web IDE on Linux: updating to the 2.11 firmware failed to complete several times.
I read this though:

If the update fails halfway it's not the end of the world - the next time you connect it should just resume from where it left off.

So I kept trying, and after about a dozen tries with both the toolbox/IDE, flashing did complete (with the IDE).

I have flashed this Bangle.js 2 with a cutting edge firmware before, and it worked fine then, so maybe it was just a fluke/flaky Bluetooth connection?