Thanks for the tip on the stickers Roy, I'll try that next time.
I've PM'd my case number.
I haven't contacted GoWifi as Cambium support had said that they would be doing so on my behalf and I didn't want to cause an unnecessary nuisance bypassing/duplicating it.
My other E400 is rock solid, just like the rest of yours with an uptime over a week with the same config that the faulty one had.
Great, here is the url for the hair dryer removal process, careful not to burn your fingers though :)