Are all network devices connected to the router or do you have a switch?

Usually MHS1 & Bridge are connected directly to the router. I have also tried to put a switch in between. No changes.

Does the Hue app work properly?

Both the MyHome_up and the Hue app work properly, and you can control  each system from its own app. But if you try to add a new hue object in the Myhome_up, the bridge is not available.

If you play with multiple resets, sometimes it works and  you can configure the Hue lamp, but after some time (hours, days, weeks) it stops working and the bridge becomes “not available” once again.

But the hue app still controls the lamp through the bridge.

In any case, the new App will be launched shortly and myhomeserver1 will be updated.

Ok, but since June there has been at least one firmware update of both the Hue bridge and the MHS1. No changes. Do you think it is a problem of the app or of the devices?

Thanks for the help anyway, at least I know it should work