Faster connect on ZT

I use ZT to connect two mobile devices using 4G. Sometimes the connection drops and needs to be re-established. Even though I can ping 8.8.8.8 very quickly after a reconnect (at either end), I find that it usually takes up to one minute for the ZT connection to be re-established. Is there something I could change (timeouts, for example) that would allow me to re-establish a broken connection within 15 seconds or so?