On Tue, 28 Aug 2018 14:09:41 +0300, you wrote:

I send you a bottle of Italian wine !!

For a bottle of wine I give the following advice:

Open the unit and remove and reseat the CPU box.
This flat tin can on top, fastened with 2 screws only.

If the error remains do the obvious,
wiggle and reseat all connectors and cables.
Careful when moving the flat cables, they easily go broke.

OE8UWW