I have an Amiga 600 with A604n, RTC module, RapidRoad USB and the Indivision ECS with 1.15 firmware. Recently, I started to get the dreaded horizontal black lines problem. The problem can be seen here (video is not mine, but shows the very same problem). I have seen over the forum that most of the time problem is related to power supply, but I am using the very same for years without issues until now. Any idea of procedure I could follow to diagnose the issue?