transmitRepeat not working in appdesigner

I'm trying to create an app in appdesigner that allows me to transmit and receive LTE signals using SDRs. Both the transmitting and receiving code works in the MATLAB scripts, however when I try to transmit in appdesigner it does not work. I have copied the code from appdesigner to the script and it works fine so I know the issue lies within appdesigner. I have also compared the variables from when the code is run in the script and when it is run in the app and they are identical. My conclusion from this is that the error is occuring with the last line, which is:

sdrTransmitter.transmitRepeat(eNodeBOutput);

I tried adding in a pause before this line. Duplicating the line also does not work. It is worth noting that if I time the configuration of receiving device well enough I can get a signal briefly but it does not continuously transmit like when run in the script. I would like to know if there is any way around this or anything I can try to circumvent this problem.