question

Hi @RobertC

Could you try disabling Modbus (or anything else connecting the GX to the home automation system) ?

I had a look at your GX device and there are large spikes of CPU activity

Unfortunately the average load value misses these, but if you look at the dbus round trip time maximum values you can see them. I can't say for sure if this is the cause, or the effect, but ideally we isolate things until they stop, and hopefully that stops the reboots as well;

The Victron warranty for the Cerbo GX is 5 years, so you should still be covered if there is actually something wrong with the hardware, but I think we can do some more troubleshooting first.

I just disabled that. I use it to control heating for the water boiler. However I don't think that it would explain that very long boot time right. We'll see if that changes anything. Those 2 spikes do not seem to reflect the reboots but rather the time I was doing factory reset and the second one for the clean reflash I think.

If CPU load has been ruled out as a cause, the next most likely cause in my experience is some issue with the power supply.

It's very important to first fully isolate the power supplies so there is no voltage and no potential for an accidental short circuit, failing to do this will almost certainly cause more issues.

A thorough check of the DC cables to the GX device, removing the DC input plug and inspecting the wires. If there is any doubt, stripping new insulation and reconnecting. Checking the inline fuse and holder, removing the fuse, checking the springs and contact area, and the fuse itself. It's only a very occasional interruption so the fault might not be visible.

Then the connection to the DC bus itself.

The other occasional cause is an issue with a USB accessory, specifically some kind of internal short in the USB cable. If you have any USB connections, disconnect them and see if that resolves it.

I had 2 restarts since so Modbus does not seem to be the issue. I will double check the wiring, I might switch temporarily to a spare laptop adapter laying around. I'll report back if that does not help either.

I did not found any errors or anything weird in /var/log/message for these 2 reboots.

This is the top command export, does it look ok?

I changed the power supply wire for a new one a routed it to 48V DC busbar direcly for 2 days and had few reboots and one total freeze where I had to unplug the power for the cerbo to boot again. Are there any other tests that I can try or do you think it's a problem with the Cerbo? BTW the boot time is still 8-10minutes.

With such a long boot time you may have a failing data drive. Reboot the gx, open a terminal and see what happens with the io. (Second line of the top screen)

When I tried reboot command from terminal, the reboot took around 2-3 minutes now, I haven't seen any spike in top in IO so nothing conclusive in there. For last 24 hours I had like few reboots and now to be sure I just tested unplugging it from power and plugging it back and it booted within like 2-3 minutes. It's acting strange, before I had much longer boot times. However random restarts are still happening.