I have same problem. I use 20 second delay for miner to start after reboot. You will find this option in control panel. Also make sure ur zone setup for RPI match the time shows in minera dashboard.
Can you run Minera with up to 5 Bades? I mean the dashboard works with up to 5 Blades?
Sorry forget to mention I get this error with my 18 grid seed(5 chip). But it is weird because it is happen always 5AM in morning. I have latest compiled from github .