It sounds like there's a PST setting that is not sticking/reverting, I'm willing to bet it's the EVRC/voice 13k setting.
Sense it keeps giving an error with QPST, you may need to reflash it completely taking it back to a shipped ROM then do all the PST setting, root, then flash the Jimmy ROM. If after that it still has the problem then it's account related.
Alternately you could have a different phone put on the account and see if it has the same issue. If so it's the account.
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