The web platform EEPROM and SD card server firmwares have stability problems at full speed, we encountered this bug with the @tweet_tree. Markus Gritsch posted test firmwares that have now been running for over 72hours without interruption. They even work when the PIC and SPI interface are overclocked beyond the datasheet specifications.
A single edit to the Microchip TCPIP stack seems to have fixed stability issues, but it’s not quite clear why as the SPI settings should now be incorrect. We’ll post an update after we run the current and updated firmware under debug.