The ESC capacitor is related to what the ESC and Motor are doing, the capacitor russmini mentions is one that goes into the RX, to protect from high current drain from the BEC, i.e. trying to steer and going to near WOT acceleration, this *might* cause the BEC to dip below its minimum current and brown out momentarily.
Search for "glitch buster".
LRP make them (i have one) Spektrum do too (SPM1600 is the pt no), and OneKiwi on here has some for sale as well. (I have a couple of those too.) They are only a few quid (under a fiver i think?) and for the effort to fit one and try it, well worth it.
Also, try rebinding and then re-calibrating your Tx/Rx (end points, zeroing trim and such) and ESC. Even try setting the ESC back to stock/factory settings. I had a similar issue that was solved by doing this. Could switch the car on, and it would work fine for about a minute, then just stop. Starting from scratch sorted the issue, its never done it since.
Also try a new/spare sensor cable/cleaning the sensor out as well. I got some gunk in mine and it made the car run *really* slow.
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