I have a savox 1258 and castle mamba max pro, and found the bec on the castle was barely enough to power the savox. The bec on the Castle is adjustable and at 5V, it was fine. 5.5V and higher, the receiver would lose power if I moved the servo back and forth very fast.
I was able to fix the problem by installing a capacitor on the receiver.
Have you tried your 1257tg with the sidewinder yet?
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