We had this issue with the 120 bought in the same batch. All of a sudden the phones would just lose power. The switch would stay up, you could see it in the dashboard, you could cycle the port but the power would never re-apply power. (We bought them for phones only and the ap’s were on 250’s in the same closet). You’d have to power cycle the switch. Support sent replacements. You have to go through the motions but I want to say we replaced 10 of 10 closets, so there was a random defect. And these were not even fully loaded at all. Closets were not datacenter cooled, but had cooling in them, and had 1U spacing so we were confident it wasn’t an overheating issue. A couple closets were even decent size rooms with 1-2 switches once we consolidated to an almost purely wireless network.
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