TP-Link Archer C6 v2 (EU) 5GHz band stopped working

Hi there. I own TP-Link Archer C6 v2 (EU) and few moments ago I installed latest snapshot available for it. Unfortunately, 5GHz stopped working. It used to work well in the past, I update my router every week. So most likely recent changes affects this router, perhaps other routers are affected as well?!