because your running a low votage to start with in a mardave at 4.8v the receiver needs a constant flow at the same current which fluctuates at lower currents when you esc its drawing power.putting in a power cap will solve your problem there cheaper to make tho rather then buying search 10v 4700uf on ebay and use an old servo plug to wire it up.
red to + black to - on the cap and in the red and black slots on the plug for the receiver and your sorted.just stick it in any spare socket
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