While using myGHL, all data between a GHL-device and GHL Connect session is copied back and forth, thus doubling the latency. The myGHL-server is in Western Europe and commonly shows round trip times of app at 100 ms and better.
If the communication exceeds 500 ms, that is when connection issues cannot be avoided anymore.

Another thing that might cause performance issues is the processing power of the mobile device being used to run the app. If other resource heavy apps are running in the background, it may bog down GHL Connect. If the app does not receive responses fast enough, communication may begin to stall.

If you're open to trying a new router, you can try the one I mentioned earlier. This would be connected off of your existing router and would become basically a secondary network which the ProfiLux can connect to.