I've owned multiple rDNA 40 (4 to be exact) devices including one from the first run, the only one that gave me issues was the first run one, and it didn't glitch or anything like that, the board decided it no longer liked the fire button and became detached. The one I'm using now is from the first run of the big screens (the non centered mega screen version) born 12/30/14, and I've never once had issues. I've even left it in the car overnight during winter to see if I could force a glitch and it never happened.
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