QuinLED Dig Uno disconnected and cannot reconnect

Hi,

I have this ESP-32 WLED controller QuinLED Dig Uno: Pre-Assembled QuinLED-Dig-Uno - quinled.info
It was working fine for few weeks. After two weeks it suddenly started flickering. Flickering was very subtle and was hard to notice if other lights were on. Simultaneously it went offline and I could not connect to it, neither through HA or through the IP address in the browser. However that sorted out itself. I believe it was due to IP changing. Before flickering it was .10 and aftewards .14.

Today it started flickering again and I could not connect to it. However, now it did not come back online. After troubleshooting I am even further from the solution than I was when the issues began. Now the led strip won’t turn on at all when the power is plugged in.

By chance I have another of those control boards that I have not used before. I removed the other and tried to use the new one and now the led strip turns on, but I cannot initialise it. There is no WLED-AP in the wlan options.

What might have caused the issue to begin and how to get the lights back to working? Thanks in advance.