Sync Error on all iOS, MacOS and Android devices

I have been getting consistent Sync Errors 500 and recently today 503 Errors. I have used OneCalendar (OC) on the following devices using the latest version of OneCalendar on each device. The devices have always been synced to both my Google & Apple iCloud calendars and for the most part have until recently, worked just fine.

• Mac running MacOS 12.2.1

• Mac running MacOSX 10.12.6

• iPad 2020 running iOS 15.3.1 (using Paid version of OC)

• iPad 2019 running iOS 15.3.1 (using Paid version of OC)

• Moto G Fast running Android 11 (Build RPJS31.Q1-53-12-11)

The errors started occurring about 10 days ago seemingly out of nowhere. I can’t find many others with the issue I have. I’ve deleted all but one of the apps on one device in the hope that it might possibly reduce the chance of database corruption down the line. Then I figured I would use that data from the one device and have all the new installs sync to that device’s database. After several days of working on this, I again have all my devices above synced to my google calendar and my Apple iCloud calendar. However, the errors still show up on launch sync and manual syncs and the data on some the devices have missing appointments. Even the devices that show an appointment that is missing on other devices, do not show that appointment when clicking on the date to see the appointments listed for that day. I’ve given up trying to fix it now but was hoping someone might have some idea how this happened.