General Question about returning mod'd phone

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http://androidforums.com – For some reason my phone reception has gotten very bad. I used to get at least a couple bars at home and now I am lucky to get one bar...it's usually no bars. The power button is also sticking. Rom's shouldn't affect signal, do they? I took it to my dealer and they recommended returning it to corporate store to return it since it is still less than a year old and covered under warranty. I know that I should revert to Metro PCS original ROM but I have two questions. If I return to factory settings it will be version 2.2.2 and I originally had 2.2.1. Does this matter? Second question is (General)