UH, I'm still here...
BTW, I looked at the pic again, and sorry, Hanno, there is NO WAY that module left Lancaster with that crystal. I have never seen an unambiguously original P2 or P3 module that had that style crystal installed. This is clearly a non-factory replacement (look at the two solder points...the original coating of black paint is gone, but it is present on all other points). My guess is that the circuit capacitance is low, giving rise to unstable, high-frequency oscillation, when it works at all. Needs to come out, and be replaced with a proper MTQ32 or MTQ32A type. It's a five-minute swap-out. Another 30 seconds on the timing machine to trim it, and you're done.