I brought a Particle Electron with a GPS tracker board with us, to track us around Iceland. I even made sure I brought the EMEA version. It hasn't worked consistently since we got here - maybe ten minutes. I spent an hour troubleshooting it this morning to no avail, so I left it on the dresser and left. Naturally I walk upstairs to go to bed, and it's working perfectly.
I give it 10-to-1 odds of still working when I want to use it in the morning.