"assign reserved IP addresses to devices between .2 & .49 so they're out of the DHCP range"
Just to clarify, and it may be a dumb question, but by assigning reserved IP between .2 and .49, you mean for the devices connected to the router? For Example, Laptop .2, Cellphone1 .3, Cellphone2 .4, TV, .5 and so on?
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Also 2nd issue, this was happening before and was the cause of me taking off the router for a few months because it was pissing me off.
When the disconnects happen, it modifies the wifi ranges for both 2.4GHz and 5GHz. For 2.4G it only allows channels 1-11 and 12, 13 are missing from the drop down selection. For 5G, it only allows 36-48, all other channels are missing. The biggest issue is that I am in a fairly dense wifi area, and a lot of the neighbouring routers are in the lower bands while the higher bands are clear but when I select those, for instance 153 and the router "disconnects", it drops all connections and I have to reboot the router to connect any device.
I attached a screenshot for reference.