Wifi-Gateway - strange behaviour

[kr0815]

I had a gateway running for about 3 weeks without any problems (Dev-Version)
Suddenly, it didn´t present messages to my controller
Strange thing was, if i did a recnnect on the controller, it worked for a few minutes
Even if i open a second putty session, i see the gateway, i see the main controller connecting

0;255;3;0;14;Gateway startup complete.

but after a few minutes, no messages from the sensors
If i open another putty-instance, it works again for a few minutes.

I thought about a hardware fault, built everythaing again, so new ESP, new NRF, other power supply, but absolute same behaviour.

Maybe a problem that i only have sensor, so i only receive messages, send nothing ?
Or is it some messages in my network the Wifi-Gateway mis-interprets ?