Siemens EQ.5 Please restart

Hello, my EQ.5 often has the error " Please restart". The machine first runs normally in the program. It is also only briefly about 1/4 coffee output. Then comes the error "Please restart". If I then perform "rinsing" once, it usually goes for a few times.
The machine is cleaned and decalcified. What can it be?
Many greetings Falk

Hello again, It always seems to be only at the first coffee after switching on. After restarting and rinsing once it runs without problems then for now.
Maybe someone knows the problem?
Many greetings

I have opened the machine and discovered on the elongated Durchlauerhitzer that a metal retaining clip for a (probably) temperature sensor has come loose. I clipped the clasp with the sensor back on. Now it runs again without error.

Displays restarting the device