All devices disconnect randomly on the WZR-1750DHP

[kneeki]

I've been using the WZR-1750DHP Airstation for a few years now and have been loving it's performance and reliability. Unfortunately, I've been experiencing some odd network disconnect issues network wide for about a week. They seem to occur randomly, with only one device on the network or many. It occurs to both WiFi channels (2.4 and 5GHz) and the wired network. When it 'disconnects', the PC's on the network do not report 'network cable unplugged', but I'm unable to reach the router via the browser (192.168.11.1). Once the connection resumes, I can easily and quickly hit the router with the browser like nothing was wrong. I'm a bit purplexed by this issue, and I'm unsure as to where I should go next.

Router log file:
Pastebin