Homematic radiator thermostat missing/loosing actuall temperature

Setup, Configuration and Use Beginners
2
  1. How are your HM devices are connected to openHAB? (CCU, CUL, Homegear, …)
  2. Could you please post your .items configuration for the HM thermostats?
    Note: Please use code fence to post code, here´s a good example.
  3. It´s normal that your items loose their value when updating them…