i highly doubt they sent 34GB in 11 hours - or, put another way, sent 34GB consistently ever 11 hours such that the keys were exhausted after the same amount of time. This isn't a smart washing machine we're talking about here, just [a] raspberry pi(s)
In exactly 11 hours on three devices, in particular. On one device, the first time it fails after 11 hours could be a coincidence (unlikely, but possible) but repeatedly happening across all three devices suggests something entirely different.
