Huawei HG533 router WiFI issue

Hi there!

I seem to be having a problem with TalkTalk Huawei HG533 router.

There is multiple devices in our home: 2 are connected by ethernet cables to router directly and several were connected wirelessly.

Up until recently this setup was operating fine, but now only wired connection is still in working.

There is no internet access on any of the wireless devices. And Windows network diagnostics tool displays "The DNS server isn't responding message" when I try to repair connection.

Can I get an advise on what settings I need to update in router dashboard? (Rebooting doesn't help)

I didn't try factory reset option yet. Hoping it can be avoided )

Many thanks,

Kuzya88