Follow-me not releasing trunks

Here’s our current setup-

tb 2.4.2

  • 1.4.18-1

We have follow-me setup on several extensions to ring technician cell phones when they are not in the office. When receiving calls this works well. When the call is completed, the trunks that were in use (incoming from caller and outgoing to cell) are not released.

Analog lines on a Rhino 4-port EC adapter. Trunks have to be manually released within FOP. It has gotten to the point where we are not answering calls from the office which defeats the purpose of having follow-me. I know this has been happening for the past 5 weeks or so - upgraded tb, * and FPBX this weekend hoping that may resolve the problem but it did not. Any ideas on what to check or how to resolve this?