It maybe your router's traffic problem. I had similar issue few weeks ago, I could connect via the app both within my home network and outside (using VPN), but unable to connect to myGHL. I also noticed that time out was quite often when using GCC via the home wifi network. My router provided both 2.4G and 5G connection, and my P4 was connected to the 2.4G connection at that time. So I changed it to 5G connection, and it's all good now, myGHL is always on and keeps on updating, and no time out problem occurred on GCC as well.