@Ivaylo my phone when connected to 5ghx can't ping (and access) for example wifi printer, or wifi plug that connect with 2.4ghz. Not always but most of the times.

@Ivaylo Already did. Nothing changed, Sometimes i can see other devices, sometimes not....

@Ivaylo Nope, the options are unchecked...

I updated firmware to 3.15.3 Build 180305 Rel.51282n. Still remain the problem.

I realized that when I connect to 5Ghz I can't communicate to devices connected to 2.4Ghz. Obviously they are in the same net and using ip given by DHCP. I can connect to wired devices and devices...