Running TM here as well and I experience what the others are saying Tobus.
My question would be ... when you reapproach the convoy where you at? What speed you running? and etc.
If the escort knows you're about they are going to alert the convoy again, which will cause the scattering.
Try a different angle of approach, come in below the thermal, and never during the course of pending attack run your TC over 1:1.
<edit>Damn Ninja'd by Ducimus!</edit>
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Snuffy!
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