Code 2.4ghz trans problem

[Chidders]

Advice please all. I purchased a used Code 2.4ghz (with multi data display)

I have x2 receivers, both placed in separate cars. with new battery's !! I had the same problem with both cars, paired with the trans no problem with both receivers but after a couple of races the cars started twitching and both cars had a mind of there own. expensive results.

is it scrap ? trans problem as both receivers cannot be faulty, can they ?
or could I your the receivers on my other basic code (without screen) trans I have ?

Thoughts ? Thanks in advance Rob