I'm also new, but I've been through that experience.

I ran a firmware update on both the RFX9600 and the remote (a TSU9600 in this case) and it appears to have fixed it. I also lowered the polling of network resources I was doing to every 5 seconds, letting the interface pretend that it was synchronised when in reality it was off by up to 4 seconds.

So if the firmware update doesn't help, my experience suggests it might be part of your code that's causing it.