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It's possible the ecu was corrupted/failed. Super unlikely, but possible. If you end up being denied warranty get an ecu off the forum for $400 and call it a day. No need to pay Subaru for a brand new one.
A past owner could have tuned it and "voided" your warranty and Subaru could possibly deny warranty for that but it would be almost impossible for that to cause this current problem. I just had a very similar problem with a Toyota dealer over cam codes. Turned out a bearing slipped, not my tune being too powerful for the cams to keep up. Good luck
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