I need some help diagnosing the problem. I have Vaterra TwinHammers with Tactic TX/RX combo. Yesterday all was working fine for about 5 minutes. Then the car stopped responding to TX. I have no throttle and steering is intermittent (very slow and jumpy). I am assuming that this is TX/RX issue, correct? I have tried new batteries in TX and fully charged Lipo in RC car. Nothing helped. Unfortunately, I only have one Tactic RX so I can't determine if this is TX or RX issue.

The specs are:

Tactic TTX300 TX + TR325 RX
Hobbywing Quicrun WP-1060 Brushed ESC 60A
Stock Dynamite motor
Hitec HS-645MG servo

Any ideas?