[Elektro] Gira Transponder and keypad problem

[TheMax74]

Hello,
i've got a problem and maybe someone can help me.
I've attached a Gira Keypad and Transponder to an audio door station stainless steel. All worked ok for some weeks.

Suddenly, the keypad and transponder suffered major problems:
- Keypad does sense the touch of the fingers only sometimes and only on some numbers (already replaced the keypad without success).
- The transponder works sometime and sometime not.
The door station works flawlessy, instead.

I noticed that when i switch the audio control device in programming mode, only the transponder led starts blikning, but not the keypad led.
I suspect some wiring problem or weaking signal.
I have 2 audio door station, 3 audio home station, 1 keypad, i transponder and 4 additional switching actuators.
The wiring is made by 0.5mm shielded cable, in a star configuration.

Can someone give me a tip to solve the problem?
Thanks!

[TheMax74]

Problem solved.
Wiring cables was too small and cable was too long.