The maddening alert popped up on Krista Kernan’s phone on a Sunday afternoon. It was happening again. Just hours before its students were to return from winter break, the Barrington School District announced Jan. 2 that it was pivoting to remote learning for two weeks. Kernan’s family had been hurled into chaos. Just like in 2020. And 2021. “That is the biggest issue with COVID and schools,” Kernan wrote in an email to NJ Advance Media. “The anxiety around the idea that within a blink of an eye, everything is turned upside down.” Like so many other beleaguered parents across New Jersey, Kernan…