Our Zapier account keeps losing connection with Constant Contact

Hello! Our Zapier account keeps losing connection with Constant Contact (CC) today. This has never happened before with CC. Earlier today one of my zaps failed to send several contacts to CC and it showed an error that said "authorization expired". I reconnected the account and it seemed fine but now my zap has failed again. I tested the connection in Zapier and it was successful so I re-ran the zap and it went through this time. Has anyone else been experiencing issues with Zapier's connection to their CC account today? Is this a CC issue? Please advise.