If you are located right next to the reciever in the same room this potentially normal (due to signal bouncing all over the place), but not if you are outside. Also double check how you have mounted your XSR to ensure it is getting enough power, and that both antennas are still good (one antenna is for RX other is for TX back to taranis). Also there is chance that your taranis antenna is damaged. But first thing to check is go outdoors and see how far you can go before you get a signal low/critical error as it should be at very least a few hundred meters in an open field.
Other minor things to look is the transmitter power level, low signal warning value on the tarnais software menu etc..