Debug the Wifi Gateway ?

[kr0815]

I built the dev version of the Wifi Gateway.
It´s running, but after several hours, it stops

I´m connected to it through my FHEM Controller and with a Putty Telnet session

Sometimes, it doesn´t fetch wireless messages from the sensors
Sometimes, it´s inaccessible from the controller / telnet
Sometimes it happens after startup, sometimes after many hours

I already tried with different power sources, capacitors,...
I also swapped the NRF24L01 to a total different one ( with / without external antenna)

Is there any possibilty for better debug output ?
By telnet, it only shows my the received / sent commands ?