not working with bypass

Hi,

I have 8 shellies installed for a while, but one of them has stopped working today. When I removed the ceiling light, I saw that the bypass was burnt. I replaced it with another one, and since then I have strange behaviour:

Without a bypass, I cannot contact the Shelly through the webinterface. It doesn't connect to my network. When a light is attached, it flickers. So far so good, right? Because this is expected behaviour when it's connected without neutral and without a bypass. However, when I do connect the bypass, the shelly does connect to the network, and I can toggle the switch via the webinterface and via s1/sw. However, there's no power on the ceiling light itself. No flickering, nothing. I checked it with on of those screwdrivers to see if there's any current, but as long as the bypass is connected, there's no current. I tried with 2 different bypasses, the thin one and the thicker one. Why is this, and how can I fix it?

Thanks for the quick reply. That fixed it! For 5 hours.. then it went offline. Cycling the power brings it back up. This always happens with on of the 3 ceilings lights that are part of the same electricity group. 3 different Shellys, 1 group, one of them always having weird behaviour. Unfortunately I lack the knowledge of troubleshooting the cause. The Shellys in the other groups are running fine and don't need power cycling.I'm planning to move house next year. If there's no neutral wire, I'll hire an electrician to hopefully get a better experience and not have to deal with bypasses and random disconnects. For the meantime, suggestions are very welcome

Update: the switch is in detached mode. There's a dimmable ZigBee light attached to it. Turning the light off sometimes triggers issues. When I turn the ZigBee light off (remember: the switch stays on because it's a ZigBee light and the switch is in detached mode), the Shelly relay may start toggling over and over again. It stops doing that when I turn on the ZigBee light again. The Shelly works fine when it's setup like a toggle switch instead of detached mode. I'm running detached because I use home assistant to have the light use different brightness percentages based on the time. It's fine for the other Shellys in the house that run in detached mode for months, but for some reason the ones in this particular electricity group always struggle.