One test you could try as part of a process of elimination is to toggle airplane mode again and see if that causes any connection problems with your car.
quote:On April 6, something known as the GPS rollover, a cousin to the dreaded Y2K bug, mostly came and went,...But in New York, something went wrong...
At 7:59 p.m. E.D.T. on Saturday, the New York City Wireless Network, or NYCWiN, went dark,...
The culprit was a long-anticipated calendar reset of the centralized Global Positioning System, which connects to devices and computer networks around the world. ... Ms. Raphael [Stephanie Raphael, Department of Information Technology and Telecommunications spokesperson] admitted that technicians have been unable to get the network back up and running, adding, “We’re working overtime to update the network and bring all of it back online.” ... Approximately every 20 years, the GPS needs to reset the way it keeps track of weeks, and Saturday, April 6, was the date selected for the most recent reset. The reset also came with an improvement in timekeeping that means the next rollover will not be needed for about 157 years.
Maybe you already said, but what was the change that means the next rollover won't be for another 157 years?
What makes me most curious is why the counter isn't a byte multiple. Why 10 bits then? Why 13 bits now? Why not 2 bytes now, providing over a thousand years? Perhaps they had to accept a solution that would work on the most memory-restricted reprogrammable device still out there? Just guessing.