Just an update to this post. I flashed back to 388.5 and my upload speed issue went away. The connection problems were a fluke caused by routing issues in the area on that particular day, but flashing to the older firmware resolved my upload speed issue. Betting it's a Verizon FiOS + GT-AXE16000 specific problem. Asus already had problems with FiOS many months ago and resolved it in a firmware update near the launch of this router.It's definitely the router, either the firmware or my GT-AXE16000 is on its way out. I just pulled the WAN cable and direct plugged it into my PC and every page loads instantly, no upload speed problems, everything is fine. Back in the router and I'm getting ERR_CONNECTION_TIMED_OUT for random pages, even sometimes pages that work on refresh don't, upload speed back in the gutter. I'm going to try backing up my settings and then resetting to default and if that doesn't work it's either the firmware flash went bad or my router is about to die.