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Almost sounds like my poor Zodiac2 as it slowly deteriorated. :(
Personally I'd take Dell up on a replacement unit. Did you try using it a few days after hard resetting WITHOUT reinstalling any 3rd party apps? I know that's a very unappealing way to use it, but maybe some app you use is the culprit? If so, your unit could be fine. So you might want to try to track that down before getting a new unit.
I'd also be really wary of that A04 update. Seems like it's been worse for many people afterwards. I know when I get my x51v next week, I'm not updating the ROM anytime too soon.
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