LeadPages Being Refused Connection to Keap

Are there any obvious things I should check to help LeadPages reconnect to Keap? It’s been working for years and suddenly stopped a few days ago. Now each time I reconnect LeadPages to Keap, the connection is made, the success message comes up on the LeadPages side and then LeadPages gets kicked off again and gives me the error message that I need to reconnect to Keap. Driving me nuts.
Thanks for any ideas you can share!
Juli