I am building a data logger for a high altitude balloon using instructions from The Ultimate High Altitude Balloon Data Logger on Instructables. I had successfully built it and it was working fine until yesterday. Suddenly, the Sparkfun Open Log did not write any data to the SD card and the UBLOX MAX M8C GPS unit is not working. The only change made was that I replaced the TMP-36 sensor as one of the prongs broke off. I am using an Arduino nano, but I switched it to an Uno board in case that was the problem. Nothing changed.
The Open Log isn't even lighting up except for as soon as I plug the Arduino into power. Normally, an LED will light up everytime it writes data to the SD card. I have reset the Open Log and nothing has changed.
The issue with the Ublox unit is similar to one I had earlier in the build process involving a library that wasn't installed. I had fixed that and made no changes to the code since, but the issue has come back, and the library that solved the issue (software serial) is still installed and there are no updates available.
I have no idea what the problem is, as it happened so suddenly. If you have any more questions I can answer them or attach the code. Any help is appreciated as I have tried everything I know.