Hello, I have a strange problem with my Mikrotik 951Ui-2HnD. Everything worked just fine, but when I changed the router from isp wifi on mobiles stopped working. Mobile can connect (Samsung s7/A7, Huawei p9lite), But wifi is extremely slow. It doesn't even want to load speed test or even google (sometimes it starts working but extremely slow compared to a laptop). But when I set static IP on mobile it works just fine. Interesting is that wifi works even with DHCP on my laptop (Lenovo legion y520). DHCP on ethernet works just fine too.

Thanks you for your help