Hi jmh, i have been debugging it today after issues last night. So a summary; the tinker board is stable no issues so no more updates for it. I use it when im doing a serious imaging run as it works perfectly. The rpi4 is a build in progress.

So i had not updated the rpi4 since the end of February 2020 as it was working ok. After the issues last night (mainly with guiding) i decide to do a full update and then the qhy issue started. The qhy and the zwo asi224 (guider) are both connected via USB3.

This morning i tried again with no luck. So i connected the qhy to the USB2 port instead of the USB3 port and presto, it worked. When i connected back to the USB3 port, the thing works.. All power connections we the same as last night after the upgrade. I then ran everything (mount via wifi, guider, imaging camera with cooling etc and everything is working under both USB2 and USB3. Really weird, i cant explain it.

I have read elsewhere on the forum issues with using USB3 and 2.4G wifi (which is how i remote to the rpi4). I switched to 5G wifi with no issues, except my mount connects via wifi and the shywatcher wifi dongles do not support 5G wifi, so i have to stick with 2.4G or go back to USB eqdirect.

Anyways, ill give it another go tonight. Maybe it is just scared of the dark

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