Do wireless routers often reboot?

Now, with the rapid rise of mobile internet, we need to access WiFi network more and more mobile devices, smart phones, tablets and even smart TV, smart sockets and other smart home equipment, but also needs the support of WiFi network, more and more devices to access home in the wireless router, Network load is getting larger , it is inevitable to make it feel powerless, if the access to too much equipment, data transmission is too large, the internal memory of the wireless router will be depleted, so we will feel obviously the network slowed down.