15W Bulb Web Interface Stops Responding

I have 3 LB01-15W-WLED-1 bulbs, when I first got them the web interface was super flakey. I would connect them to WiFi and within a few minutes the web interface would stop responding. It appears that it was no longer listening on port 80. If I reset it then it would start working again, so I decided to upgrade them to wled 0.13.3 (WLED_0.13.3_ESP02.bin). This seemed to work, but now all 3 have stopped responding on port 80 again...