Your pool is limited to 21 devices and configured with a one-day lease. It's most likely that you're exhausting the available addresses, especially if you support phones, tablets, laptops, and other mobile devices. I'd cut way back on the excluded addresses, maybe reserve 192.168.1.1 through 192.168.1.20 for the router itself and any servers, printers, and other statically configured devices. Delete the excluded addresses listing that starts at 121. If you really need 230 addresses for static devices, consider expanding to a /23 subnet or putting the static devices on a separate routed subnet. Shortening the lease time to an hour may also help, but it looks like the pool is just too small with that many held back in excluded ranges.
I never considered that @Jayh. I have deleted the excluded range 121-230. Let me see if that opens it up.