Comment 8 for bug 1755198

I'm pretty sure this is due to the installed / featured / editor's picks being loaded at the same time and all loading the channel information. The channel code was copied off the screenshot code and has no thread protection.

The solution is to only load the screenshot and channel information when explicitly requested by GNOME software - this is done when you select and individual app. There is possibly other bugs like this and this could also be triggered if other code paths in GNOME Software attempt to load screenshots and channels from different threads.