I have photon that has been working fine in UK, it does simple data acquisition using Blynk library. We then need to ship this unit to US for demo. I understand with the DNS problem of blynk, but I believe no such an issue with Particle cloud. But when we switch on the unit in US, it looks to be connected (breathing cyan) for few seconds, get the connected event on Console dashboard, then it does disconnected (blinking green). We have tried many things, reproduce on second unit, and also try to VPN back to UK. None of them work. Let me know if code is needed, but before that I can tell it does Blynk.virtualWrite() perhaps 5-10 per second.
Setting it to safe mode is difficult, as it in sealed, fragile, tiny space casing. So if anything can be done before that would be helpful.