Having done what John suggests, if the double post happened because of the device you were using then maybe you should consider the possibility that you were using an inappropriate device.
I don't think that anybody could accuse me of being a too-infrequent poster here, but when I'm not using my PC I don't fret, and think "by golly, I really ought to be using my phone/tablet right now to participate in DIYnot".
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