They are made using existing customers and vehicles. I don't assign technicians or resources for any appointments until they are in the garage being worked on the day of their appointment.

I make them a several days out and at some point they disappear Im not sure when. I only know when I print out schedules I know they are missing appointments then people show up that I remember had appointments.

I haven't noticed a pattern. They are all made as appointments by myself the same way I make all of them without an invoices or work orders started.

Everything is checked under filtering and resource view mode.

It seems to be an almost daily event. Appointments I know were put in the schedule have been disappearing on their own. Its been causing time conflicts with customers and causing a lot of delays that could be avoided. We are using version 7.1.7.6.

Anyone else have this problem?