R8000 keeps crashing

My Netgear r8000 running 19.07.2 is having weird issues. First off, the device occasionally stops transmitting the SSIDs. Other times, it will give me an error saying the password for the network is wrong (on iOS devices). Right now, it isn't allowing me to access LUCI via even though that should (and usually does) work properly.

All in all - this sucks. Is it something I've done?

I have around 35 devices (smart home and 5-8 people in the house) on the network. Could that be part of the problem? Have I exceeded the max number of devices?