domain sync features in fewer intervals than 1 hour - chenge settings from hours to minuts
if you have over 1200 domains today the domain sync only evry 1 hour 50 domains. its take mor then 24 hours the domain sync.
if you renew domain by register the domain not sync by whmcs. and next yeir you don know you need to renew the domain and losed him.
My suggestion is to chenge the Domain Sync Settings from hours to minuts
This way everyone can set the frequency according to their needs and according to the number of domains they have.