Kinda sounds like what happens when I run a different car and I forget to change model number on my remote. It will beep when turning on the ESC and the tires will turn but doesn't make the second set of beeps when it recognizes the remote so throttle won't work untill I change model #
Not fimiliar with that ESC but try re-binding your remote and Reciever.
XRAY T4 14 - Orca - Futaba
Serpent 811 Cobra GT-E - Tekin - Hitec
Serpent 811 BE 2.0 - Tekin - Hitec