When you say lipo in the Tx, do you mean a LiFe pack? a lipo will be too high voltage at 7.4V - the T4GRS runs on 6V, but you can get away with a 6.6V LiFe, or you can use the 5xNiMh pack. Also check the battery type on the Tx is definitely set to the type you have, DRY4, NIMH5 OR LIFE2 - it's in the System menu.
Solder blob may have been putting the ESC into short protection - did you notice if you still had steering when glitching or did everything stop?
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