Problems with Advanced Print Module

We are running 6.1. We have [purchased Advanced print module about 6
months ago, and it has been a bit of a nightmare.

Thne issue is that APM runs Ok for some of the time and then (for no
reason that we can see) it stops. This is an intermittent problem.

Our vantage supplier / maintainer have no solutions.

Has anyone else run into similar problems.