In reply to you first Steve, the screens are on my phone, laptop and one of several PCs all connected on the same local network as the ATOM Pi. I'm sorry but I don't know what you mean by "Kiosk" mode, but I access the ATOM Pi through a Chrome browser and direct connection via local address 192.168.1.175 etc.
Understood. By kiosk mode, I'm referring to a second RPi which runs Chrome from auto boot, no mouse or keyboard, looking only at the VRS via the relevant IP address.
Yes, I reboot the ATOM Pi through the login screen and selecting option 10. The Pi reboots and after a few minutes I see the "Reconnect" window and on clicking that I'm taken to the home screen with the message" Attempting to connect to the ATOM Grid". When that clears, usually I can select the "Radar" tab and the ATOM grid screen loads fine. However, occasionally I just get an empty browser screen and no amount of refreshing will load the ATOM data. Navigating back to the Home screen, everything else works fine except the Radar tab which just leaves me with the empty browser.
I've seen something similar when there is a problem with bandwidth in the LAN. Low hanging fruit, easy stuff, a ten minute attempt at a fix, can you reboot all the IP chain? I'd say turn off the switch with Wifi at the ATOM/shack end, then the Wifi receiver for the same in the house, then last of all the two Powerline adaptors. Leave off for 2 minutes, then fire up starting from the Powerline adaptors, then the Wifi bridge at that end, then lastly the switch/bridge at the shack end. I suspect the Powerline adaptors have gone low bandwidth, I've seen this before.
Then you can post that I'm a grasper of straws...
I've done a fair amount of work with PoE and think especially for cheap IP cameras it can save a lot of time, and cope with long runs... Maybe this might be a long term solution.
I also think that the LM317 is up against it... says 1.5A in the data sheet and doesn't mention anything above that. One solution might be to set the output slightly higher.
RPi 3B specs say 5.1V & 2.5A. I'm going to say the LM317 is out of its depth...