Unusual LED status

My TT GW was working great, all 4 LED’s on and steady.

I was watching the GW traffic on my laptop, and when I pulled the same page up on my mobile, the packets stopped coming through and the GW’s LED status looks like:
1: On, steady
2: Blinking slowly
3: On, steady
4: Off

Does anyone know why the GW might be ‘crashing’ like this, and what this arrangement of LEDs means?

Cheers

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