I have a tamiya connector on the 8.4v battery. Do you think it can't handle the increase demand of amperage? I honestly doubt that the battery is at fault since I was able to operate once the battery died a little. I am using a banana connector adapter. Shall I install banana connectors on the battery?
Yes, either install a banana plug on the battery or swap both to deans or traxxas plugs. Tamiya plugs a HORRIBLE. Ive seen them melt together once when used on a caldera 10e. And that truck doesnt use any more amps then your buggy. And that was with a 7.2v nimh.
Even when tamiya plugs "feel" tight, they often have play and loose contact. Id bet thats why the ESC went into LVC mode.
Also, while adaptors are "easy" adding more connectors is restricting power flow. Keeping connectors simple and wiring short helps the power to flow more freely.