Fritsch 6/650E error FE3

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Hello) I have ran into a problem with my dough sheeting machine Fritsch 6/650E

So, in low positions of sheeting shaft, it can go into error mode, signaling FE3 and stop working entirely. Problem doesn't dissappear if I manually bring the shaft up or down. And, when it just stays off for some time — it still bring up the FE3, but then when I turn it off and on again — it works perfect. Untill again FE3...

Maybe someone here has the same problem as I do now, please share you solutions to this, I'd appreciate any help

Thank you very much