MIM-H03 Air-conditioning Wifi Kit not any more connected to SmartThings app

Hi all,
I have Samsung air conditionning system with MIM-H03 Air-conditioning Wifi Kit so that I can control the A/C using SmartThings app. started early March, I lost the ability to control the A/C with the app, connection is lost though I tried to reconfigure many times.
The real pain is, I had heating programs set up for the winter, and I cannot stop them from keeping running, though summer is now close.
Is anyone here aware of this and able to help with solutions ?
Many thanks in advance
Matthieu