Guessing you meant SR200 vs SR201. It depends on the transmitter. I think their DSMR capable transmitters work with DSMR, DSM2 and DSM receivers. It appears both of those receivers are the older DSM version.
Really need to see a video of what yours is doing as that's 2 completely different radio systems. Like does the LED on the receiver shut off when it happens? Does it flicker or blink? Do both servos stop responding?