PROBLEM SOLVED! The problem was in the trunk hatch switch. The protective rubber around the switch was broken and moisture got inside causing switch not to operate.
Besides the minus temperatures here in Estonia(about -2 celsius) the work was not that complicated. I managed to remove the whole trim panel while breaking only one of the
fixing studs😄. And thats using only big flathead screwdriver and not special trim removal tool. So, only way to access the switch is to remove the whole trim panel. Then you will see
the switch from inside. I pulled also a list outside the hatch holding the number plate lights bit away to get the switch out from its hole. Then I made short thin jumper wire and shorted
the switch connector ends to simulate switch operation. There is a connector close where you can remove the switch. And woilaa, latch working every time I shorted the connector.
Now need to order a new switch and put everything back together. So if anybody have similar problem in future you might know where to start looking the problem first. Also you can
check switch protective rubber at first place before starting to make any removal of panels at all.
PS! Does anybody know where could be the best place to order online, ebay maybe?