Hi K.Zsolt,
Let you know for history on this scanner. We already replced for a spare part(a new one) same like this case since last year around Feb (Please see as below and in attached).
So, it was a reason as reasonable. Should not be root cause from the functional scanner. Include Lifetime of the scan engine just only 1 yr.
Whatever, High Possibility from human. It is a good for us, please provide the ICR.
On the other hand, If you have the other reason or a better Thing. Please let me know.
We prompt to consider on that. Thanks you.