Wi-Fi Router acting up, dropping connections, causing buffering
On average there's about 30 devices connected to the router. Mix of devices; smartphones, smart TVs, streaming devices (apple tv/fire tv), computers, security cams. smart bulbs. Currently SmartConnect is enabled so the router assigns a device to the best band. Lately I've noticed the router has been dropping device connections where the device has to be re-connected to the router manually by entering the wifi password vs automatically. When streaming on some of the smart TVs, the connection buffers or is sluggish, content quality drops from HD to SD. Devices on the WLAN are a mix of 802.11n and 802.11ac.
The only recent change was adding two additional smart bulbs bringing the total of connected devices to 30. I have DHCP enabled with a range of 50 assignable IPs. I'm running the latest available firmware version. ISP speed is 200Mbps down & 20Mbps up. This may sound weird but before our down speed was 100Mbps and we weren't having any problems. Recently our ISP raised our speed to 200Mbps. I would think the doubling of speed would be better and we shouldn't be having any buffering issues at all.
Could it be that the router can't handle 30 devices at once? Is there a max number of devices these routers can handle before showing speed degradation? Is it just time for a router upgrade?