Siemens EH675LDC1E (induction hod)

[emimad]

Hi all!
I've having problems with my induction hod since few months. It's a random issue so that it's difficult to diagnose it.
In a normal operation use, the hod suddenly starts beeping and all the displays flashes without any error code, only the power level number selected before.
The stuff is the same like if the touch panel was dirty/wet, although it isn't.
When this happen, nothing can be done, only switch off the hod with the power on/off key. However, when turning it on again, the issue persists.
The only way to walk around this is disconnect the mains cable. Then, the hod works fine again.

My thoughts are that the problem is into the touch panel, so that I'm looking for the Repair Manual where all the part numbers appears.
Any kind of suggestion will be welcome!