Forerunner 235 not displaying menu

A user is having problems displaying menus on his Forerunner 235 device. We have an app with 2+ screens, each with a purpose specific menu. From the error report it sounds like he is only able to open a menu on one of the screens, and the menu shown is belonging to another screen.

The app works perfectly alright on the simulator and on the physical devices we have at hand (Quatix 3 & 5 and Vivoactive 3)

The device has the latest firmware 7.90 and the app is compiled with the latest SDK (3.1.6).

Anyone having had a similar experience ?