D-Link DWR-118 A1 - problem with 5GHz - MediaTek MT7610E

Does someone have this same problem with DWR-118 A1 with 5GHz? Maybe someone knows a solution? On original firmware 5GHz work very well but on OpenWrt isn't.

Similar problem with driver MT MediaTek MT7610E is Asus RT-AC51U -> support for 5GHz