This could be you opportunity to upgrade to a better rxtx combo
My racing tt02 currently has https://www.modelsport.co.uk/product/etronix-pulse-ex3g-3ch-24ghz-fhss-wheel-radio-system-1346492 (6 years so far 0 issues)
Wife's tamiya grasshopper has https://hobbyking.com/en_us/hobbykingr-tmhk-gt2b-3ch-2-4ghz-transmitter-and-receiver-w-rechargable-li-ion-battery-1 (2 years 0 issues)