iPrint appliance stops communicating with identity source

Appliance 23.4.  People using printers that require authentication will randomly lose access to those printers.  They will not be able to login.  So far the only solution is to reboot the appliance.  Then everything comes back for a few weeks until the problem repeats itself.  Anyone have any thoughts?  I have run the iPrint appliance for years without any troubles and this version is the first to have this issue.