I had the same problem started a couple of weeks ago with the box I have 2 other boxes from a different manufacturer and they work fine, I have tried different cams only thing I found help was to install a bare openviz image off the zgemma site and just install cam file this box doesn't seem to like the backup images around at the minute .
Things now seem better now
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Oh and if u have a swapfile on a external drive/ usb stick u may have to delete that as I had to
